RFR: JDK-6251738: Want a top-level summary page that itemizes all spec documents referenced from javadocs (OEM spec) [v4]

[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 incrementally with one additional commit since the last revision:

  address review feedback

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8439/files
  - new: https://git.openjdk.java.net/jdk/pull/8439/files/2992b6bc..47e7179e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8439&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8439&range=02-03

  Stats: 11 lines in 2 files changed: 1 ins; 6 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8439.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8439/head:pull/8439

PR: https://git.openjdk.java.net/jdk/pull/8439