Do not add new paragraphs in the \value description,
which breaks the generated HTML table. Instead, use \br
more often to break overly long lines.
Replace 'option is only valid' or 'supported' by
'effective' and 'used'; if an enum doesn't apply to a
dialog or platform it will just be ignored, but it's
OK to set it.
Fix link to DontUseCustomDirectoryIcons enum.
Pick-to: 6.5 6.6 6.7
Task-number: QTBUG-119551
Change-Id: Iac86a85c7b3b402997fa14f4c4e2fa7111c62e9e
Reviewed-by: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>
8fd3f7e578