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

[Radim Vansa]

> 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

-------------

Changes:
  - all: https://git.openjdk.org/crac/pull/51/files
  - new: https://git.openjdk.org/crac/pull/51/files/bd2886bd..0f34254b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=crac&pr=51&range=01
 - incr: https://webrevs.openjdk.org/?repo=crac&pr=51&range=00-01

  Stats: 20 lines in 2 files changed: 20 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/crac/pull/51.diff
  Fetch: git fetch https://git.openjdk.org/crac pull/51/head:pull/51

PR: https://git.openjdk.org/crac/pull/51