RFR: JDK-8305406: Add @spec tags in java.base/java.* (part 2) [v3]

[Jonathan Gibbons]

> Please review a doc update to add `@spec` into the rest of the files in `java.base` (compared to those in [JDK-8305206](https://bugs.openjdk.org/browse/JDK-8305206) PR #13248)

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.org/jdk/pull/13336/files
  - new: https://git.openjdk.org/jdk/pull/13336/files/2e5425b0..03a70694

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13336&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13336&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/13336.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13336/head:pull/13336

PR: https://git.openjdk.org/jdk/pull/13336