RFR: 8202: JMC 9 release notes [v2]

[Marcus Hirt]

> First draft! Please let me know what I missed. :)

Marcus Hirt has updated the pull request incrementally with one additional commit since the last revision:

  Acting on feedback

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Changes:
  - all: https://git.openjdk.org/jmc/pull/555/files
  - new: https://git.openjdk.org/jmc/pull/555/files/cb0c0cfa..64ab04ca

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmc&pr=555&range=01
 - incr: https://webrevs.openjdk.org/?repo=jmc&pr=555&range=00-01

  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jmc/pull/555.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/555/head:pull/555

PR: https://git.openjdk.org/jmc/pull/555