RFR: 8267329: Modernize Javadoc code to use instanceof with pattern matching [v8]

[Ian Graves]

> 8267329: Modernize Javadoc code to use instanceof with pattern matching

Ian Graves has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains eight commits:

 - Merge master
 - Re-inserting class cast with some revised pattern usage
 - Additional name cleanup
 - Additiona name refactoring
 - Name refactoring
 - Name shortening. Copyright updates.
 - Typos
 - Updating javadoc to use instanceof patterns

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Changes: https://git.openjdk.java.net/jdk/pull/4105/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4105&range=07
  Stats: 99 lines in 24 files changed: 0 ins; 11 del; 88 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4105.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4105/head:pull/4105

PR: https://git.openjdk.java.net/jdk/pull/4105