The stanza describing WIFCONTINUED has a close parenthesis, but no corresponding open parenthesis. The WIFSTOPPED description doesn't parenthesize the statement describing when the macro can evaluate to true, so this shouldn't be parenthesized either.
--- wait.2~ Tue Sep 26 14:55:36 2006 +++ wait.2 Tue Sep 26 14:55:36 2006 @@ -166,7 +166,7 @@ control stop. This macro can be true only if the wait call specified the .Dv WCONTINUED -option). +option. .It Fn WIFEXITED status True if the process terminated normally by a call to .Xr _exit 2