QDoc: Clean up html output

Running tidy (find . -type f -name "*.html" -exec echo {} \; -exec tidy -e --show-info no {} \;) on our expected output data for the generatedOutput test generates some warnings about malformed html:

./properties/testqdoc-testderived.html
line 148 column 102 - Warning: discarding unexpected </a>
Tidy found 1 warning and 0 errors!

./qml-qdoc-test-type.html
line 27 column 245 - Warning: missing </a> before <a>
line 33 column 16 - Warning: nested emphasis <b>
line 34 column 16 - Warning: nested emphasis <b>
line 35 column 16 - Warning: nested emphasis <b>
line 36 column 16 - Warning: nested emphasis <b>
line 37 column 16 - Warning: nested emphasis <b>
line 38 column 16 - Warning: nested emphasis <b>
line 41 column 16 - Warning: nested emphasis <b>
line 42 column 16 - Warning: nested emphasis <b>
line 46 column 16 - Warning: nested emphasis <b>
line 50 column 16 - Warning: nested emphasis <b>
line 51 column 16 - Warning: nested emphasis <b>
line 55 column 16 - Warning: nested emphasis <b>
line 59 column 21 - Warning: nested emphasis <b>
line 60 column 16 - Warning: nested emphasis <b>
line 61 column 16 - Warning: nested emphasis <b>
line 72 column 28 - Warning: <p> anchor "fifth-prop" already defined
line 75 column 28 - Warning: <p> anchor "fourth-prop" already defined
line 86 column 28 - Warning: <p> anchor "group.first-prop" already defined
line 89 column 28 - Warning: <p> anchor "group.second-prop" already defined
line 92 column 28 - Warning: <p> anchor "group.third-prop" already defined
line 102 column 28 - Warning: <p> anchor "id-prop" already defined
line 112 column 28 - Warning: <p> anchor "name-prop" already defined
line 123 column 28 - Warning: <p> anchor "type-attached-prop" already defined
line 137 column 28 - Warning: <p> anchor "completed-signal" already defined
line 148 column 28 - Warning: <p> anchor "group.created-signal" already defined
line 160 column 28 - Warning: <p> anchor "configured-signal" already defined
line 173 column 28 - Warning: <p> anchor "disable-method" already defined
line 176 column 28 - Warning: <p> anchor "enable-method" already defined
line 186 column 28 - Warning: <p> anchor "copy-method" already defined
Tidy found 30 warnings and 0 errors!

./qml-uicomponents-tabwidget.html
line 29 column 16 - Warning: nested emphasis <b>
line 30 column 16 - Warning: nested emphasis <b>
line 60 column 28 - Warning: <p> anchor "current-prop" already defined
Tidy found 3 warnings and 0 errors!

./qml-qdoc-test-doctest.html
line 31 column 16 - Warning: nested emphasis <b>
line 32 column 16 - Warning: nested emphasis <b>
line 36 column 16 - Warning: nested emphasis <b>
line 37 column 16 - Warning: nested emphasis <b>
line 41 column 16 - Warning: nested emphasis <b>
line 42 column 16 - Warning: nested emphasis <b>
line 54 column 28 - Warning: <p> anchor "active-prop" already defined
line 65 column 28 - Warning: <p> anchor "name-prop" already defined
line 80 column 28 - Warning: <p> anchor "completed-signal" already defined
line 90 column 28 - Warning: <p> anchor "foo-signal" already defined
line 102 column 28 - Warning: <p> anchor "fail-method" already defined
line 113 column 28 - Warning: <p> anchor "fail_hard-method" already defined
Tidy found 12 warnings and 0 errors!

./qml-uicomponents-switch.html
line 29 column 16 - Warning: nested emphasis <b>
line 33 column 16 - Warning: nested emphasis <b>
line 46 column 28 - Warning: <p> anchor "on-prop" already defined
line 57 column 28 - Warning: <p> anchor "toggle-method" already defined
Tidy found 4 warnings and 0 errors!

./headerfile/testheader.html
line 14 column 1 - Warning: trimming empty <ul>
Tidy found 1 warning and 0 errors!

One or more empty elements were present in the source document but
dropped on output. If these elements are necessary or you don't want
this behavior, then consider setting the option "drop-empty-elements"
to no.

./qml-qdoc-test-type-obsolete.html
line 14 column 16 - Warning: nested emphasis <b>
Tidy found 1 warning and 0 errors!

./qml-qdoc-test-type-members.html
line 13 column 16 - Warning: nested emphasis <b>
line 14 column 16 - Warning: nested emphasis <b>
line 15 column 16 - Warning: nested emphasis <b>
line 16 column 16 - Warning: nested emphasis <b>
line 17 column 16 - Warning: nested emphasis <b>
line 18 column 16 - Warning: nested emphasis <b>
line 21 column 16 - Warning: nested emphasis <b>
line 22 column 16 - Warning: nested emphasis <b>
line 23 column 16 - Warning: nested emphasis <b>
line 24 column 16 - Warning: nested emphasis <b>
line 25 column 16 - Warning: nested emphasis <b>
line 26 column 21 - Warning: nested emphasis <b>
line 27 column 16 - Warning: nested emphasis <b>
line 28 column 16 - Warning: nested emphasis <b>
line 29 column 16 - Warning: nested emphasis <b>
line 30 column 16 - Warning: nested emphasis <b>
Tidy found 16 warnings and 0 errors!

./qml-int.html
line 21 column 20 - Warning: nested emphasis <b>
line 32 column 28 - Warning: <p> anchor "abs-method" already defined
Tidy found 2 warnings and 0 errors!

./includefromexampledirs/qml-qdoc-test-abstractparent-members.html
line 13 column 16 - Warning: nested emphasis <b>
line 14 column 21 - Warning: nested emphasis <b>
Tidy found 2 warnings and 0 errors!

./includefromexampledirs/qml-qdoc-test-abstractparent.html
line 30 column 16 - Warning: nested emphasis <b>
line 34 column 21 - Warning: nested emphasis <b>
line 45 column 28 - Warning: <p> anchor "children-prop" already defined
line 57 column 28 - Warning: <p> anchor "rear-method" already defined
Tidy found 4 warnings and 0 errors!

./crossmodule/testtype.html
line 51 column 1 - Warning: inserting implicit <p>
line 51 column 1 - Warning: trimming empty <p>
Tidy found 2 warnings and 0 errors!

One or more empty elements were present in the source document but
dropped on output. If these elements are necessary or you don't want
this behavior, then consider setting the option "drop-empty-elements"
to no.

./qml-test-nover-typenoversion.html
line 22 column 242 - Warning: missing </a> before <a>
Tidy found 1 warning and 0 errors!

./qml-uicomponents-progressbar.html
line 28 column 16 - Warning: nested emphasis <b>
line 29 column 16 - Warning: nested emphasis <b>
line 30 column 16 - Warning: nested emphasis <b>
line 31 column 16 - Warning: nested emphasis <b>
line 32 column 16 - Warning: nested emphasis <b>
line 45 column 28 - Warning: <p> anchor "color-prop" already defined
line 56 column 28 - Warning: <p> anchor "maximum-prop" already defined
line 66 column 28 - Warning: <p> anchor "minimum-prop" already defined
line 87 column 28 - Warning: <p> anchor "value-prop" already defined
Tidy found 9 warnings and 0 errors!

./qml-qdoc-test-yetanotherchild.html
line 28 column 16 - Warning: nested emphasis <b>
line 38 column 28 - Warning: <p> anchor "prop-prop" already defined
Tidy found 2 warnings and 0 errors!

./qmlpropertygroups/qml-qdoc-test-anotherchild-members.html
line 13 column 16 - Warning: nested emphasis <b>
line 17 column 16 - Warning: nested emphasis <b>
line 18 column 16 - Warning: nested emphasis <b>
line 19 column 16 - Warning: nested emphasis <b>
line 20 column 16 - Warning: nested emphasis <b>
Tidy found 5 warnings and 0 errors!

./qmlpropertygroups/qml-qdoc-test-parent.html
line 29 column 16 - Warning: nested emphasis <b>
line 30 column 16 - Warning: nested emphasis <b>
line 31 column 16 - Warning: nested emphasis <b>
line 32 column 16 - Warning: nested emphasis <b>
line 45 column 28 - Warning: <p> anchor "group.a-prop" already defined
line 48 column 28 - Warning: <p> anchor "group.b-prop" already defined
line 51 column 28 - Warning: <p> anchor "group.c-prop" already defined
Tidy found 7 warnings and 0 errors!

./qml-qdoc-test-child.html
line 30 column 16 - Warning: nested emphasis <b>
line 31 column 16 - Warning: nested emphasis <b>
line 35 column 21 - Warning: nested emphasis <b>
line 36 column 21 - Warning: nested emphasis <b>
line 37 column 21 - Warning: nested emphasis <b>
line 47 column 28 - Warning: <p> anchor "children-prop" already defined
line 57 column 28 - Warning: <p> anchor "name-prop" already defined
line 68 column 28 - Warning: <p> anchor "name-method-1" already defined
line 78 column 28 - Warning: <p> anchor "name-method" already defined
line 88 column 28 - Warning: <p> anchor "rear-method" already defined
Tidy found 10 warnings and 0 errors!

./qml-linkmodule-grandchild-members.html
line 14 column 16 - Warning: nested emphasis <b>
line 18 column 16 - Warning: nested emphasis <b>
line 19 column 16 - Warning: nested emphasis <b>
line 20 column 16 - Warning: nested emphasis <b>
line 21 column 16 - Warning: nested emphasis <b>
Tidy found 5 warnings and 0 errors!

./qml-qdoc-test-abstractparent.html
line 30 column 16 - Warning: nested emphasis <b>
line 31 column 16 - Warning: nested emphasis <b>
line 35 column 21 - Warning: nested emphasis <b>
line 36 column 21 - Warning: nested emphasis <b>
line 37 column 21 - Warning: nested emphasis <b>
line 47 column 28 - Warning: <p> anchor "children-prop" already defined
line 57 column 28 - Warning: <p> anchor "name-prop" already defined
line 68 column 28 - Warning: <p> anchor "name-method-1" already defined
line 78 column 28 - Warning: <p> anchor "name-method" already defined
line 88 column 28 - Warning: <p> anchor "rear-method" already defined
Tidy found 10 warnings and 0 errors!