Fix a large number of typos and other problems (#110)

Most of these fixes are for typos and extra whitespace at the
end of lines. These are the notable changes:
- Fixed a compatibility issue with how asterisks are displayed
  using certain fonts. Bug report: https://github.com/att/ast/issues/764
- Fixed a bug in the man page that caused searches for the '|'
  character to fail. Bug report: https://github.com/att/ast/issues/871
- Removed a duplicate description of 'set -B' from the man
  page. Bug report: https://github.com/att/ast/issues/789
- Added documentation for options missing from the ksh man
  page (applies to 'hist -N', 'sleep -s', 'whence -q' and
  many of ulimit's options). Bug reports:
  https://github.com/att/ast/issues/948
  https://github.com/att/ast/issues/503#issuecomment-386649715
  https://github.com/att/ast/issues/507#issuecomment-507924608
- Applied the following ksh2020 documentation fixes:
  https://github.com/att/ast/pull/351
  https://github.com/att/ast/pull/352
- Fixed a minor GCC -Wformat warning in procopen.c by changing
  a sentinel to NULL.

src/lib/libast/man/find.3

@@ -57,18 +57,18 @@ via
 or
 .IR at .
 .PP
-.L findopen 
-returns a handle to a 
+.L findopen
+returns a handle to a
 .I fastfind
-stream for the 
-.I ksh 
+stream for the
+.I ksh
 file pattern
 .IR pattern .
 .L findnext
 returns the next pathname that matches the pattern specified by
 .IR handle .
 .L findnext
-returns 
+returns
 .L 0
 when no more pathnames match the pattern.
 Finally,
@@ -78,7 +78,7 @@ closes the
 stream for
 .IR handle .
 .SH BUGS
-These rotuines are only as good as the
+These routines are only as good as the
 .I fastfind
 information which is in the system administration domain.
 .SH "SEE ALSO"