Switch from \*(Ba to | in man pages

This follows recommendations from mdoc(7):

  As a special case, the predefined string \*(Ba is handled and rendered in the
  same way as a plain `|' character. Using this predefined string is not
  recommended in new manuals.

Moreover, \*(Ba is unsupported by man-db and causes errors on systems which use
it.
Merge pull request #414 from ryanakca/manfix

Switch from \*(Ba to | in man pages