docs [Improvement]: Consistency for spelling of "canceled" in non-API docs

Is this issue for a product update or release that is not yet available to customers?

No? Then please continue. Thank you!

What article(s) is affected?

The following files (corresponding to articles on docs.github.com and including REST content that's in Markdown) seem to use the word "cancelled" in prose:

actions/learn-github-actions/contexts.md
actions/learn-github-actions/expressions.md
authentication/keeping-your-account-and-data-secure/reviewing-your-security-log.md
codespaces/troubleshooting/troubleshooting-creation-and-deletion-of-codespaces.md
communities/maintaining-your-safety-on-github/blocking-a-user-from-your-organization.md
communities/maintaining-your-safety-on-github/blocking-a-user-from-your-personal-account.md
developers/github-marketplace/selling-your-app-on-github-marketplace/pricing-plans-for-github-marketplace-apps.md
developers/github-marketplace/using-the-github-marketplace-api-in-your-app/testing-your-app.md
developers/github-marketplace/using-the-github-marketplace-api-in-your-app/webhook-events-for-the-github-marketplace-api.md
developers/github-marketplace/using-the-github-marketplace-api-in-your-app/handling-plan-cancellations.md
developers/github-marketplace/creating-apps-for-github-marketplace/viewing-metrics-for-your-listing.md
developers/github-marketplace/creating-apps-for-github-marketplace/viewing-transactions-for-your-listing.md
developers/apps/guides/creating-ci-tests-with-the-checks-api.md
organizations/keeping-your-organization-secure/managing-security-settings-for-your-organization/reviewing-the-audit-log-for-your-organization.md
organizations/managing-membership-in-your-organization/removing-a-member-from-your-organization.md
site-policy/github-terms/github-corporate-terms-of-service.md
site-policy/github-terms/github-terms-of-service.md
sponsors/receiving-sponsorships-through-github-sponsors/managing-your-sponsorship-tiers.md

There's a lot of use of "cancelled" in the REST API docs but a quick and dirty grep similar to the one above shows that all of it is related to products (ie it's canned in API requests/responses and we shouldn't change it/can't change it)

Describe the desired docs changes and the problem they solve for customers.

We should be using the word canceled (US English, described by MS Style guide) where appropriate in the documentation prose.

Some of the instances of cancelled are in referential material like "Contexts," or status check functions like in "Expressions". Since these refer to GitHub Actions contexts or special functions, we shouldn't change them.