[Perl/perl5] 170a63: perlguts.pod: fix typo when describing scope stack

[Richard Leach]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 170a6378bcd18e0dc2ad6112c7bbaa3818642173
      
https://github.com/Perl/perl5/commit/170a6378bcd18e0dc2ad6112c7bbaa3818642173
  Author: Richard Leach <richardle...@users.noreply.github.com>
  Date:   2020-02-28 (Fri, 28 Feb 2020)

  Changed paths:
    M pod/perlguts.pod

  Log Message:
  -----------
  perlguts.pod: fix typo when describing scope stack