[Perl/perl5] e1980a: release managers guide: add a second update target

[Ricardo Signes via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: e1980ad27865f520fa3edc0b5f40d633766fb4ba
      
https://github.com/Perl/perl5/commit/e1980ad27865f520fa3edc0b5f40d633766fb4ba
  Author: Ricardo Signes <rjbs@semiotic.systems>
  Date:   2022-05-28 (Sat, 28 May 2022)

  Changed paths:
    M Porting/release_managers_guide.pod

  Log Message:
  -----------
  release managers guide: add a second update target