RFR: 8375683: Add notes for sctp tests [v3]

[SendaoYan]

On Tue, 20 Jan 2026 19:17:43 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> SendaoYan has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Add index in testing.html
>
> doc/testing.md line 649:
> 
>> 647: pre-installed. So the SCTP tests will be skipped by default. If you want to
>> 648: enable the SCTP tests, you should install the SCTP library before run the
>> 649: tests.
> 
> Suggested text:
> 
> The SCTP tests require the SCTP runtime library, which is often not installed by default in popular Linux distributions. Without this library, the SCTP tests will be skipped.

Thanks for the suggestion. The text has been updated.

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PR Review Comment: https://git.openjdk.org/jdk/pull/29320#discussion_r2710795541