RFR: 8330178: Clean up non-standard use of /** comments in `java.base` [v2]

[Jonathan Gibbons]

On Fri, 19 Apr 2024 19:47:20 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> Unless it is absolutely necessary, I would not fix comments in `jdk.internal.icu` sources, as they are in the upstream code, and would like to minimize the merging effort.

@naotoj Given the policy and strong desire to compile `java.base` with all lint warnings enabled and `-Werror`, all of the proposed changes in this PR will each individually break the build if/when the warning is added to `javac` and we continue to compile `java.base` with the current build settings.

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PR Comment: https://git.openjdk.org/jdk/pull/18846#issuecomment-2067246948