RFR: 8332101: Add an `@since` to `StandardOperation:REMOVE` in `jdk.dynalink`

[Nizar Benalla]

Code cleanup, please review this simple change.
To help with the review, this was added back in https://bugs.openjdk.org/browse/JDK-8191905
TIA

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Commit messages:
 - add an `@since` and modify Copyright header

Changes: https://git.openjdk.org/jdk/pull/19189/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19189&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332101
  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/19189.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19189/head:pull/19189

PR: https://git.openjdk.org/jdk/pull/19189