[jdk21] RFR: 8311115: Type in java.lang.reflect.AccessFlag.METHOD_PARAMETER

[Joe Darcy]

Make the docs in JDK 21 better too.

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Commit messages:
 - Backport d97966266e343671693825d2211a34fa45dd271d

Changes: https://git.openjdk.org/jdk21/pull/82/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21&pr=82&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311115
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21/pull/82.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/82/head:pull/82

PR: https://git.openjdk.org/jdk21/pull/82