RFR: 7265: Update Release Notes for 8.1.0 [v2]

[Marcus Hirt]

> Updated for 8.1.0.

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

  Updating since 7122 is now fixed

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

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/285/files
  - new: https://git.openjdk.java.net/jmc/pull/285/files/c3fdaf41..2f7b44cb

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jmc&pr=285&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jmc&pr=285&range=00-01

  Stats: 11 lines in 1 file changed: 0 ins; 10 del; 1 mod
  Patch: https://git.openjdk.java.net/jmc/pull/285.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/285/head:pull/285

PR: https://git.openjdk.java.net/jmc/pull/285