[Perl/perl5] 28bee1: perl_langinfo.h: Fix typos

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 28bee18f1c59c1a0842da61ad3e9cdff4cf42b20
      
https://github.com/Perl/perl5/commit/28bee18f1c59c1a0842da61ad3e9cdff4cf42b20
  Author: Karl Williamson <k...@cpan.org>
  Date:   2024-02-13 (Tue, 13 Feb 2024)

  Changed paths:
    M perl_langinfo.h

  Log Message:
  -----------
  perl_langinfo.h: Fix typos

Commit 7fa3c53d55c304560ddc569ba9ae6760380eb112 added these lines; the
problem is that each should have had a trailing underscore in the names.