Remove incomplete paragraph from QSet::iterator documentation

I could trace the dangling 'However, ' back to Qt 4.2. We probably will
never knew what the rest of the sentence was, exactly ... since the
previous paragraph is anyhow covering the same grounds we can just
remove the paragraph.

Change-Id: I1dda56e1ad17932205b8f40a527ca90a7592ad40
Reviewed-by: Ulf Hermann <ulf.hermann@digia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Doc: Adding a new page to Qt Creator's external page file.

-new page called "Creating an Android Applicaion"

Change-Id: Ibe17f7c96aee3fe6c549a27d3b0f2b93cc0a5453
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>