[Perl/perl5] c28ce7: `Select.pm`: Add `my` to synopsis

[Elvin Aslanov via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: c28ce7c2bef045f16cf61e534ac98183da1c9e8a
      
https://github.com/Perl/perl5/commit/c28ce7c2bef045f16cf61e534ac98183da1c9e8a
  Author: Elvin Aslanov <rwp.prim...@gmail.com>
  Date:   2023-11-10 (Fri, 10 Nov 2023)

  Changed paths:
    M dist/IO/lib/IO/Select.pm

  Log Message:
  -----------
  `Select.pm`: Add `my` to synopsis

To scope variables