[Perl/perl5] e97ba8: perlapi: SvPVbyte_force() and kin: clarify.

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: e97ba88224d5c0d59252d9295deddec8426e12b0
      
https://github.com/Perl/perl5/commit/e97ba88224d5c0d59252d9295deddec8426e12b0
  Author: Karl Williamson <k...@cpan.org>
  Date:   2020-12-20 (Sun, 20 Dec 2020)

  Changed paths:
    M sv.h

  Log Message:
  -----------
  perlapi: SvPVbyte_force() and kin: clarify.