Doc: Fix some titles and links

Make page titles follow the conventions at
http://qt-project.org/wiki/Spelling_Module_Names_in_Qt_Documentation

.

Make class/type list titles follow the "<Qt Module> C++ Classes" and
"<Qt Module> QML Types" formats.

Links are updated accordingly, along with broken links found during this
sweep. Some inline links also have their surrounding text modified, to
improve flow.

Change-Id: I0ed7788caa250085d7ea0080a77d8a2655debf39
Reviewed-by: Alan Alpert <aalpert@blackberry.com>