RFR: 8342566: Improve javadoc of java.lang.annotation.ElementType [v2]

[Kevin Bourrillion]

> 8342566: Improve javadoc of java.lang.annotation.ElementType

Kevin Bourrillion has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision:

 - Merge branch 'openjdk:master' into element-type-javadoc
 - Merge branch 'openjdk:master' into element-type-javadoc
 - Merge branch 'openjdk:master' into element-type-javadoc
 - handle review comments from Chen
 - maybe ready for review now
 - Merge branch 'openjdk:master' into element-type-javadoc
 - keep revising
 - massive rewrite

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Changes:
  - all: https://git.openjdk.org/jdk/pull/21506/files
  - new: https://git.openjdk.org/jdk/pull/21506/files/457f4cf0..3c8acc4d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21506&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21506&range=00-01

  Stats: 30518 lines in 343 files changed: 9549 ins; 19628 del; 1341 mod
  Patch: https://git.openjdk.org/jdk/pull/21506.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21506/head:pull/21506

PR: https://git.openjdk.org/jdk/pull/21506