[crac] RFR: CRaC related documentation in JDK classes using custom tag [v2]

[Radim Vansa]

On Tue, 28 Feb 2023 12:33:11 GMT, Radim Vansa <rvansa at openjdk.org> wrote:

>> As proposed in https://mail.openjdk.org/pipermail/crac-dev/2023-February/000496.html I am adding some CRaC related documentation.
>
> Radim Vansa has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add timers related docs

Updated based on #53 being merged and softened wording based on comments.

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PR Comment: https://git.openjdk.org/crac/pull/51#issuecomment-1618209577