add attribute documentation for spell checking
add attribute documentation for spell checking

svn path=/trunk/KDE/kdelibs/kate/; revision=992784

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