chore: add comment in sliding expiration cache

[karenc-bq]

Summary

Add comment in sliding expiration cache to indicate item has been removed from the cache map.

Description

Additional Reviewers

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[github-actions]

Qodana Community for JVM

It seems all right 👌

No new problems were found according to the checks applied

💡 Qodana analysis was run in the pull request mode: only the changed files were checked

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      - name: 'Qodana Scan'
        uses: JetBrains/qodana-action@v2023.3.1
        with:
          upload-result: true

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