RFR: JDK-8305593: Add @spec tags in java.desktop [v2]

[Jonathan Gibbons]

> Please review a docs-only change to add `@spec` tags into `java.desktop` public API files

Jonathan Gibbons 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 three additional commits since the last revision:

 - Update narrative references to use `rfc-editor.org` instead of (variants of) `ietf.org`
 - Merge remote-tracking branch 'upstream/master' into 8305593.at-spec-java.desktop
 - JDK-8305593: Add @spec tags in java.desktop

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13360/files
  - new: https://git.openjdk.org/jdk/pull/13360/files/374a088c..fcccc85f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13360&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13360&range=00-01

  Stats: 493097 lines in 5807 files changed: 403689 ins; 46411 del; 42997 mod
  Patch: https://git.openjdk.org/jdk/pull/13360.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13360/head:pull/13360

PR: https://git.openjdk.org/jdk/pull/13360