RFR: 8267329: Modernize Javadoc code to use instanceof with pattern matching [v3]

[Ian Graves]

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

Ian Graves has updated the pull request incrementally with one additional commit since the last revision:

  Name shortening. Copyright updates.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4105/files
  - new: https://git.openjdk.java.net/jdk/pull/4105/files/d4634500..f52300f1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4105&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4105&range=01-02

  Stats: 75 lines in 21 files changed: 0 ins; 1 del; 74 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