chore: fix spelling in CommonAlertTemplatesForm.config.ts

[daniellee]

What this PR does

Spelling fix. Noticed during a demo that cheatsheet was misspelled.

[CLAassistant]

All committers have signed the CLA.

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 30 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[daniellee]

I can update it or close it. It is just a spelling fix - I can open an issue instead if you want to fix it yourselves.