[Perl/perl5] e6f2f6: Clarify descriptions of unicode_eval and evalbytes.

[Felipe Gasper via perl5-changes]

  Branch: refs/heads/blead
  Home:   https://github.com/Perl/perl5
  Commit: e6f2f64a464f83abbdbf00ebc19f68846766ac58
      
https://github.com/Perl/perl5/commit/e6f2f64a464f83abbdbf00ebc19f68846766ac58
  Author: Felipe Gasper <fel...@felipegasper.com>
  Date:   2021-05-31 (Mon, 31 May 2021)

  Changed paths:
    M lib/feature.pm
    M pod/perlfunc.pod
    M regen/feature.pl

  Log Message:
  -----------
  Clarify descriptions of unicode_eval and evalbytes.

Issue #18801