[Perl/perl5] ee5117: GH #18047: Initial phrasing for =head5 and =head6

[Sawyer X via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: ee5117509fdb6ed3324e9d129ac0de08d9873ea3
      
https://github.com/Perl/perl5/commit/ee5117509fdb6ed3324e9d129ac0de08d9873ea3
  Author: Sawyer X <xsawy...@cpan.org>
  Date:   2021-07-03 (Sat, 03 Jul 2021)

  Changed paths:
    M pod/perlpod.pod
    M pod/perlpodspec.pod

  Log Message:
  -----------
  GH #18047: Initial phrasing for =head5 and =head6