Remove trailing spaces from doc/fixes36.1 (only a couple),
doc/Guidebook.mn (several), and doc/Guidebook.tex (many). I re-split
some lines made wider by embedded formatting directives, but tried to
avoid getting carried away with that.
I think I added one missing period to Guidebook.mn and one missing
comma to Guidebook.tex. Aside from that, they should format the same
as they did before this patch.
5086c89658