docs: document Line Length Limit in katepart config
docs: document Line Length Limit in katepart config

BUG: 292703
FIXED-IN: 4.8.2

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