Fix broken links in the QtWidgets examples.

I remove the widgets examples from the gui docs as they will
introduce broken duplicates (under doc/qtgui/...).

Change-Id: I54255ceaf4187477da3e82f6809be41fb98378a2
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>

src/gui/doc/qtgui.qdocconf

@@ -43,7 +43,6 @@ sourcedirs  += .. \
                ../../../examples/gui/doc
 
 exampledirs += ../../../examples/gui \
-               ../../../examples/widgets \
                snippets
 
 imagedirs   += images

src/widgets/doc/qtwidgets.qdocconf

@@ -43,4 +43,5 @@ excludedirs += snippets
 
 imagedirs   += images \
                ../../../doc/src/images \
-               ../../../examples/widgets/doc/images
+               ../../../examples/widgets/doc/images \
+               ../../../examples/widgets