[Perl/perl5] be319b: handy.h: Add clarifying comment

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: be319be3519a71b4f83463937d76d7e2ce14e7fe
      
https://github.com/Perl/perl5/commit/be319be3519a71b4f83463937d76d7e2ce14e7fe
  Author: Karl Williamson <k...@cpan.org>
  Date:   2021-02-02 (Tue, 02 Feb 2021)

  Changed paths:
    M handy.h

  Log Message:
  -----------
  handy.h: Add clarifying comment