RFR: JDK-8325687: SimpleJavaFileObject specification would benefit from implSpec [v2]

[Joe Darcy]

> While reading the spec in the context of another potential change, noticed some cases where using implSpec would lead to a better structured specification.

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

  Implement review feedback.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17854/files
  - new: https://git.openjdk.org/jdk/pull/17854/files/e035c02b..e5b57897

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17854&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17854&range=00-01

  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/17854.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17854/head:pull/17854

PR: https://git.openjdk.org/jdk/pull/17854