RFR: JDK-8285688: Add links to JEPs and JSRs to SourceVersion [v2]

[Joe Darcy]

> 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.)

Joe Darcy has updated the pull request incrementally with one additional commit since the last revision:

  Fix title of JSR 201.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8413/files
  - new: https://git.openjdk.java.net/jdk/pull/8413/files/4d0f0829..39c1b70e

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8413&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8413&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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