[Perl/perl5] 64a595: fix a typo

[Tony Cook via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 64a5950af609117d2098f7616334aff77df9ed63
      
https://github.com/Perl/perl5/commit/64a5950af609117d2098f7616334aff77df9ed63
  Author: Tony Cook <t...@develop-help.com>
  Date:   2021-01-06 (Wed, 06 Jan 2021)

  Changed paths:
    M pod/perldiag.pod

  Log Message:
  -----------
  fix a typo