qmllint: beautify --help output

ag@ag:~/work/build/qt5$ ./qtbase/bin/qmllint --help
Usage: ./qtbase/bin/qmllint [options] files
QML syntax verifier and analyzer

All warnings can be set to three levels:
    disabled - Fully disables the warning.
    info - Displays the warning but does not influence the return code.
    warning - Displays the warning and leads to a non-zero exit code if encountered.


Options:
  -h, --help                   Displays help on commandline options.
  --help-all                   Displays help including Qt specific options.
  -v, --version                Displays version information.
  -s, --silent                 Don't output syntax errors
  --json                       Output linting errors as JSON
  --write-defaults             Writes defaults settings to .qmllint.ini and
                               exits (Warning: This will overwrite any existing
                               settings and comments!)
  --ignore-settings            Ignores all settings files and only takes
                               command line options into consideration
  --alias <level>              Warn about alias errors (default: warning)
  --compiler <level>           Warn about compiler issues (default: disable)
  --deprecated <level>         Warn about deprecated properties and types
                               (default: warning)
  --import <level>             Warn about failing imports and deprecated
                               qmltypes (default: warning)
  --inheritance-cycle <level>  Warn about inheritance cycles (default: warning)
  --multiline-strings <level>  Warn about multiline strings (default: info)
  --property <level>           Warn about unknown properties (default: warning)
  --required <level>           Warn about required properties (default:
                               warning)
  --signal <level>             Warn about bad signal handler parameters
                               (default: warning)
  --type <level>               Warn about unresolvable types and type
                               mismatches (default: warning)
  --unqualified <level>        Warn about unqualified identifiers and how to
                               fix them (default: warning)
  --unused-imports <level>     Warn about unused imports (default: info)
  --with <level>               Warn about with statements as they can cause
                               false positives when checking for unqualified
                               access (default: warning)
  --resource <resource>        Look for related files in the given resource
                               file
  -I, --qmldirs <directory>    Look for QML modules in specified directory
  --bare                       Do not include default import directories or the
                               current directory. This may be used to run
                               qmllint on a project using a different Qt
                               version.
  -i, --qmltypes <qmltypes>    Import the specified qmltypes files. By default,
                               all qmltypes files found in the current directory
                               are used. When this option is set, you have to
                               explicitly add files from the current directory
                               if you want them to be used.

Arguments:
  files                        list of qml or js files to verify