Campbell Pool

@bkabrda I've modified it based on your feedback. Let me know if the spelling fixes should be split out into a separate PR.

I was waiting for employer approval to complete the CLA, but it looks like https://github.com/returntocorp/semgrep-rules/commit/56ca767dd28fd898ac2445aabf42fb8730feeac0 has deprecated this rule and so this PR is no longer needed.