https://doc-snapshots.qt.io/qt6-dev/qml-color.html

The first lines of the source file

qtdeclarative\src\quick\doc\src\qmltypereference.doc are 

\qmlvaluetype color
\ingroup qtquickvaluetypes
\brief an ARGB color value.
\target colorvaluetypedocs

The \c color type refers to an ARGB color value. It can be specified in a number of ways:

\list
\li By a \l{SVG Color Reference}

, such as "red", "green" or "lightsteelblue".

but as can be seen in the screenshot of the published docs the first few words are missing.