RFR: JDK-6251738: Want a top-level summary page that itemizes all spec documents referenced from javadocs (OEM spec) [v12]

[Jonathan Gibbons]

> Please review the code and tests to add support for a new `@spec url title` tag to javadoc.  Note, this does not include any changes to API doc comments to use the new tag in JDK API documentation; that will come later.

Jonathan Gibbons has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 19 commits:

 - Fix typo and merge error
 - Merge with upstream/master
 - Update @since tags
 - Merge remote-tracking branch 'upstream/master' into 6251738.spec-tag-2
 - Merge remote-tracking branch 'upstream/master' into 6251738.spec-tag-2
 - Updates for latest repo
 - Merge remote-tracking branch 'upstream/master' into 6251738.spec-tag-2
 - Merge remote-tracking branch 'upstream/master' into 6251738.spec-tag-2
 - Merge with upstream/master
 - fix copyright dates
   remove archaic obsolete build flags
 - ... and 9 more: https://git.openjdk.org/jdk/compare/eeac3da7...214b9244

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Changes: https://git.openjdk.org/jdk/pull/8439/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=8439&range=11
  Stats: 1502 lines in 41 files changed: 1474 ins; 6 del; 22 mod
  Patch: https://git.openjdk.org/jdk/pull/8439.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/8439/head:pull/8439

PR: https://git.openjdk.org/jdk/pull/8439