better documentation + Note for KDE5
better documentation + Note for KDE5

svn path=/trunk/KDE/kdelibs/interfaces/ktexteditor/; revision=1093244

hlamer/kate,sandsmark/kate,DickJ/kate,hlamer/kate,sandsmark/kate,DickJ/kate,cmacq2/kate,cmacq2/kate,sandsmark/kate,cmacq2/kate,hlamer/kate,hlamer/kate,hlamer/kate,hlamer/kate,sandsmark/kate,DickJ/kate,hlamer/kate,jfmcarreira/kate,hlamer/kate,DickJ/kate,jfmcarreira/kate,hlamer/kate,hlamer/kate,jfmcarreira/kate