RFR: 8374749: Clarify AnnotationValue specification [v2]

[Joe Darcy]

> Make the correspondence between AnnotationValue cases and the cases listed in JLS 9.6.1 more explicit.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Refine text in response to review comments.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29101/files
  - new: https://git.openjdk.org/jdk/pull/29101/files/9708246a..b8fd4770

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29101&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29101&range=00-01

  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/29101.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29101/head:pull/29101

PR: https://git.openjdk.org/jdk/pull/29101