Link to correct issue in @todo in CommentManager

Problem/Motivation

As discovered in #3123832: [META] Fix @todo items referencing closed issues, there is a @todo in \Drupal\comment\CommentManager which has a link to an issue that is closed as a duplicate.

Let's point that link to the issue that is still open.

Steps to reproduce

Proposed resolution

- The current @todo links to #1029708: History table for any entity
- That was closed as a duplicate of #2081585: [META] Modernize the History module, which is actually a [META] issue
- Of that [META] issue, #3267011: [PP1] Use the HistoryRepository in the comment & node modules is the one we're after.
- Let's also change to comment in the @todo, so it tells what we're trying to achieve. In case the newly linked issue changes it saves us the time of doing archaeology like we're doing in this issue.

Remaining tasks

User interface changes

API changes

Data model changes

Release notes snippet