RFR: 8159527: Collections mutator methods should all be marked as optional operations

Wed Aug 2 23:24:33 UTC 2023

Adjust the leading javadoc sentence of several collections mutator methods to include "(optional operation)" as appropriate. Also adjust doc for UnsupportedOperationException on those methods as necessary.

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Commit messages:
 - Adjust wording of various UnsupportedOperationException docs.
 - Note (optional operation) and UOE in appropriate places.

Changes: https://git.openjdk.org/jdk/pull/15127/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=15127&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8159527
  Stats: 70 lines in 5 files changed: 17 ins; 8 del; 45 mod
  Patch: https://git.openjdk.org/jdk/pull/15127.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15127/head:pull/15127

PR: https://git.openjdk.org/jdk/pull/15127