RFR: 8342566: Improve javadoc of java.lang.annotation.ElementType [v3]

[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 nine 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
 - 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/3c8acc4d..8f74c311

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=21506&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=21506&range=01-02

  Stats: 217776 lines in 2376 files changed: 138300 ins; 54805 del; 24671 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