[Perl/perl5] a53cc5: perldiag: numer -> number typo fix

[Christian Walde (Mithaldu)]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: a53cc5a4d7455fe00bb9905602e3469144e6e468
      
https://github.com/Perl/perl5/commit/a53cc5a4d7455fe00bb9905602e3469144e6e468
  Author: Christian Walde <walde.christ...@gmail.com>
  Date:   2021-06-29 (Tue, 29 Jun 2021)

  Changed paths:
    M pod/perldiag.pod

  Log Message:
  -----------
  perldiag: numer -> number typo fix