RFR: 8255758: JEP 380 spec clarifications [v3]

[Michael McMahon]

> Minor spec changes from spec approved in initial CSR

Michael McMahon has updated the pull request incrementally with two additional commits since the last revision:

 - update from Alan's comment Nov 17
 - minor change suggested by Daniel

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1021/files
  - new: https://git.openjdk.java.net/jdk/pull/1021/files/52c12762..ce3bb6ff

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1021&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1021&range=01-02

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1021.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1021/head:pull/1021

PR: https://git.openjdk.java.net/jdk/pull/1021