RFR: 8370910: Cleanup terminology of UUID vs Global Identifiers in UUID

[Kieran Farrell]

Replacing 'global identifier' with 'UUID' for consistancy in the spec as suggested during the review of JDK-334015.

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Commit messages:
 - spec update

Changes: https://git.openjdk.org/jdk/pull/28435/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28435&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8370910
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/28435.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28435/head:pull/28435

PR: https://git.openjdk.org/jdk/pull/28435