[crac] RFR: Document CRaCCheckpointTo and CRaCRestoreFrom in java(1) man page

[Jan Kratochvil]

Document CRaCCheckpointTo and CRaCRestoreFrom in java(1) man page.

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Commit messages:
 - Document CRaCCheckpointTo and CRaCRestoreFrom in java(1) man page.

Changes: https://git.openjdk.org/crac/pull/49/files
 Webrev: https://webrevs.openjdk.org/?repo=crac&pr=49&range=00
  Stats: 17 lines in 1 file changed: 17 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/crac/pull/49.diff
  Fetch: git fetch https://git.openjdk.org/crac pull/49/head:pull/49

PR: https://git.openjdk.org/crac/pull/49