RFR: 8285368: Overhaul doc-comment inheritance [v10]

[Pavel Rappo]

> Please review this long-awaited change to documentation inheritance.
> 
> This change improves "methods comment algorithm" and introduces directed documentation inheritance. While "methods comment algorithm" -- automatic search for inheritable documentation -- has been improved, it still cannot read an author's mind so as to always find the documentation they intended. From now on, an author can state their intention, by providing an FQN of the superclass or superinterface from which to inherit documentation:
> 
> ​{@inheritDoc S}
> 
> Which is exactly what I did to counterbalance some of the JDK API Documentation changes caused by the change to "methods comment algorithm".

Pavel Rappo 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 17 additional commits since the last revision:

 - Merge branch 'master' into 8285368
 - Update @since tags
 - Add a test
 - fix failing SourceDocTreeScannerTest
 - Merge branch 'master' into 8285368
 - feedback: use JavadocTester.out
   
   Also, trivially fixes grammar (word order) in a comment.
 - feedback: remove unduly restrictive warning
 - suggestion: vocabulary
 - feedback: DocLint terminology
 - feedback: use utils directly
 - ... and 7 more: https://git.openjdk.org/jdk/compare/5a217d2b...5b6af244

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14357/files
  - new: https://git.openjdk.org/jdk/pull/14357/files/563a8761..5b6af244

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14357&range=09
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14357&range=08-09

  Stats: 8391 lines in 228 files changed: 1225 ins; 6803 del; 363 mod
  Patch: https://git.openjdk.org/jdk/pull/14357.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14357/head:pull/14357

PR: https://git.openjdk.org/jdk/pull/14357