RFR: 8338333: Add jls links to javax.lang.model.element.Modifier [v3]

[Joe Darcy]

> The javadoc in javax.lang.model.element.Modifier would be more informative to readers if it linked to the relevant JLS sections discussing that modifier.

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Update copyright year.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/20572/files
  - new: https://git.openjdk.org/jdk/pull/20572/files/2e45196b..adc18630

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=20572&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=20572&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/20572.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20572/head:pull/20572

PR: https://git.openjdk.org/jdk/pull/20572