[Perl/perl5] 2100da: perlguts: fix ref count in tie() example

[iabyn via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 2100da0d758d65f39a3c82feb2c8991dbad7a821
      
https://github.com/Perl/perl5/commit/2100da0d758d65f39a3c82feb2c8991dbad7a821
  Author: David Mitchell <da...@iabyn.com>
  Date:   2024-01-03 (Wed, 03 Jan 2024)

  Changed paths:
    M pod/perlguts.pod

  Log Message:
  -----------
  perlguts: fix ref count in tie() example

Spotted by Marcel Telka.