[Perl/perl5] ef4243: Update POSIX synopsis

[Elvin Aslanov via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: ef4243669d823be16f3bfc156d92e3d61964b87a
      
https://github.com/Perl/perl5/commit/ef4243669d823be16f3bfc156d92e3d61964b87a
  Author: Elvin Aslanov <rwp.prim...@gmail.com>
  Date:   2022-09-10 (Sat, 10 Sep 2022)

  Changed paths:
    M ext/POSIX/lib/POSIX.pm
    M ext/POSIX/lib/POSIX.pod

  Log Message:
  -----------
  Update POSIX synopsis