Many of the errors fixed in this commit are word repetitions
such as 'the the' and minor spelling errors. One formatting
error in the ksh man page has also been fixed.
A column of whitespace in the NEWS file was removed for consistent
formatting. Most of the spelling errors were found with this
codespell dictionary:
https://github.com/orbitcowboy/codespell_dictionary
(cherry picked from commit 0e36b17abe5609c461a3e4da7041eb0fdf9991b7)