[Perl/perl5] f45ba1: perlapi: Document sv_dup(_inc)?

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: f45ba102ff7bfce07641cfd49cd18ef4e8a7f6e3
      
https://github.com/Perl/perl5/commit/f45ba102ff7bfce07641cfd49cd18ef4e8a7f6e3
  Author: Karl Williamson <k...@cpan.org>
  Date:   2022-05-20 (Fri, 20 May 2022)

  Changed paths:
    M embed.fnc
    M sv.c

  Log Message:
  -----------
  perlapi: Document sv_dup(_inc)?