RFR: JDK-8285688: Add links to JEPs and JSRs to SourceVersion

Wed Apr 27 01:35:23 UTC 2022

To provide more context to readers about the development of the language, add to the enum constants in SourceVersion @see links to the JEPs and JSRs that added features to a release.

(For now, have left out @see links to preview features.)

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Commit messages:
 - JDK-8285688: Add links to JEPs and JSRs to SourceVersion

Changes: https://git.openjdk.java.net/jdk/pull/8413/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8413&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8285688
  Stats: 35 lines in 1 file changed: 35 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8413.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8413/head:pull/8413

PR: https://git.openjdk.java.net/jdk/pull/8413