Update repo settings doc (#15323)

Author: trask

.github/repository-settings.md

@@ -11,8 +11,8 @@ private admin repo.
 - `FLAKY_TEST_REPORTER_ACCESS_KEY` - owned by [@laurit](https://github.com/laurit)
 - `GPG_PASSWORD` - stored in OpenTelemetry-Java 1Password
 - `GPG_PRIVATE_KEY` - stored in OpenTelemetry-Java 1Password
-- `GRADLE_PUBLISH_KEY`
-- `GRADLE_PUBLISH_SECRET`
+- `GRADLE_PUBLISH_KEY` - owned by [@trask](https://github.com/trask)
+- `GRADLE_PUBLISH_SECRET` - owned by [@trask](https://github.com/trask)
 - `NVD_API_KEY` - stored in OpenTelemetry-Java 1Password
   - Generated at https://nvd.nist.gov/developers/request-an-api-key
   - Key is associated with [@trask](https://github.com/trask)'s gmail address