[Perl/perl5] 08629c: perlapi: Document SvPV_free

[Karl Williamson via perl5-changes]

  Branch: refs/heads/smoke-me/khw-pr_api2
  Home:   https://github.com/Perl/perl5
  Commit: 08629ca798983d0fc7c8bf7c513ecba647c7fa51
      
https://github.com/Perl/perl5/commit/08629ca798983d0fc7c8bf7c513ecba647c7fa51
  Author: Karl Williamson <k...@cpan.org>
  Date:   2020-10-08 (Thu, 08 Oct 2020)

  Changed paths:
    M sv.h

  Log Message:
  -----------
  perlapi: Document SvPV_free