[Perl/perl5] 74d55a: perlapi: Document do_close

[Karl Williamson via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: 74d55a0b67f1bce968ab7ee84b6a4c7e6a73bfcb
      
https://github.com/Perl/perl5/commit/74d55a0b67f1bce968ab7ee84b6a4c7e6a73bfcb
  Author: Karl Williamson <k...@cpan.org>
  Date:   2022-06-01 (Wed, 01 Jun 2022)

  Changed paths:
    M doio.c

  Log Message:
  -----------
  perlapi: Document do_close