RFR: JDK-8301636: Minor cleanup in CommentHelper and DocPretty

[Pavel Rappo]

On Wed, 1 Feb 2023 21:14:42 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review some simple cleanup suggested by IntelliJ IDEA that would be too much of a distraction in an otherwise unrelated PR.

Looks good (assuming tests pass).

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Marked as reviewed by prappo (Reviewer).

PR: https://git.openjdk.org/jdk/pull/12375