[Perl/perl5] 7b88a3: Update File::Spec synopsis

[Elvin Aslanov via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 7b88a34f3abd2662f6c449391320ac1f582b4043
      
https://github.com/Perl/perl5/commit/7b88a34f3abd2662f6c449391320ac1f582b4043
  Author: Elvin Aslanov <rwp.prim...@gmail.com>
  Date:   2022-08-30 (Tue, 30 Aug 2022)

  Changed paths:
    M dist/PathTools/lib/File/Spec.pm

  Log Message:
  -----------
  Update File::Spec synopsis

Add `my` to examples for better practice.