RFR: 8280122: SupportedGroupsExtension should output "named groups" rather than "versions"

[John Jiang]

On Tue, 18 Jan 2022 19:52:27 GMT, Weijun Wang <weijun at openjdk.org> wrote:

>>> If so, should the `SupportedVersionsExtension` get a more precise description as well?
>> 
>> I did not get the point.  Did you mean to update the comment on the SupportedVersionsExtension, by adding RFC 8446?
>
> No, I just meant updating `""versions": '['{0}']'"` to `""supported versions": '['{0}']'"` there.

I looked through SupportedGroupsExtension.java and found many examples, like the followings,
> no supported named group specified
the supported named groups
contains no supported named groups
No default named groups
Ignore inactive or disabled named group
... ...

so I finally used "named groups".

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PR: https://git.openjdk.java.net/jdk/pull/7123