[Perl/perl5] 0797ed: perlapi: Document amagic(_deref)?_call

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 0797ed673c3083c5458e984824b608f502c58d9c
      
https://github.com/Perl/perl5/commit/0797ed673c3083c5458e984824b608f502c58d9c
  Author: Karl Williamson <k...@cpan.org>
  Date:   2022-05-19 (Thu, 19 May 2022)

  Changed paths:
    M embed.fnc
    M gv.c

  Log Message:
  -----------
  perlapi: Document amagic(_deref)?_call