[Perl/perl5] e88531: remove template content from perl5390delta

[Graham Knop via perl5-changes]

  Branch: refs/heads/haarg/fix-perl5390delta
  Home:   https://github.com/Perl/perl5
  Commit: e88531a0be43ca9c6efa8bf1ada9b95b2966f142
      
https://github.com/Perl/perl5/commit/e88531a0be43ca9c6efa8bf1ada9b95b2966f142
  Author: Graham Knop <ha...@haarg.org>
  Date:   2023-08-21 (Mon, 21 Aug 2023)

  Changed paths:
    M pod/perl5390delta.pod

  Log Message:
  -----------
  remove template content from perl5390delta

The 5.39.0 release is identical to 5.38.0, so there is no content to
fill these sections with.