RFR: 8328541: Remove or update obsolete comment in JRootPane

[Abhishek Kumar]

On Fri, 29 Mar 2024 07:21:17 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> There is an old obsolete comment in JRootPane that is between the main documentation comment for the class and the declaration of the class itself which is  causing interference with the work to support Markdown in documentation comments using the `///` style of comment. (JEP 467) so removing this comment..

Marked as reviewed by abhiscxk (Committer).

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PR Review: https://git.openjdk.org/jdk/pull/18545#pullrequestreview-1968587598