[Development] Removing the \compat QDoc command

[casper.vandonderen at nokia.com]

Hi,

We have multiple commands to mark documentation content as outdated:
\deprecated, \obsolete and \compat. \compat was used for Qt3 compatibility.
There are only 12 occurrences of \compat under qt5.git in the
documentation, but none of that documentation actually gets printed.
So please change the used command to \obsolete, or remove the QDoc
comment, because this will give new QDoc errors once \compat is taken out
of qdoc.

The 12 locations of \compat outside of qdoc/the qdoc manual are:
qtbase/src/printsupport/kernel/qprinter.cpp:373
qtbase/src/sql/kernel/qsql.qdoc:43
qtbase/src/sql/kernel/qsql.qdoc:54
qtbase/src/widgets/dialogs/qcolordialog.cpp:2005
qtbase/src/widgets/dialogs/qcolordialog.cpp:2010
qtbase/src/widgets/kernel/qapplication.cpp:3952
qtbase/src/widgets/kernel/qapplication.cpp:4050
qtbase/src/widgets/kernel/qapplication.cpp:4056
qtbase/src/widgets/widgets/qmenubar.cpp:1911
qtbase/src/widgets/widgets/qslider.cpp:540
qtbase/src/widgets/widgets/qslider.cpp:547
qtbase/src/widgets/widgets/qtextedit.cpp:2496


Casper