RFR: JDK-8261510: Use RFC numbers and protocol titles in sun.security.ssl.SSLExtension comments [v3]

[Bradford Wetmore]

On Thu, 11 Feb 2021 10:10:58 GMT, John Jiang <jjiang at openjdk.org> wrote:

>> This is a simple cleanup for sun.security.ssl.SSLExtension.
>> The comments for the extension groups would use the RFC numbers and the protocol titles correspondingly.
>> It also removes a trailing space in extension token_binding, and move signature_algorithms and signature_algorithms_cert to RFC 8446 extension group.
>
> John Jiang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   A extension group comment uses both of RFC number and protocol title

Looks good, thanks.

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Marked as reviewed by wetmore (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2517