Remove redundant markup and words except in two instances where
the removal would put the marked up section at the beginning of
the sentence, which we try to avoid. These need to be dealed with
separately by rephrasing the sentence.

Obtained from:	    Jenkins checkstyle igor(8) warnings


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@46057 c2e8774f-c49f-e111-b436-862b2bbc8956