Improve GitHub Actions concurrency documentations

[rvesse]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/actions/using-jobs/using-concurrency

What part(s) of the article would you like to see updated?

There are a couple of common confusions that seem to arise from this piece of the documentation:

1. Whether cancel-in-progress allows expressions (yes it does)
2. That even with cancel-in-progress: false (or an expression that evaluates to false) pending jobs can still be cancelled as concurrency groups are limited to 1 running and 1 pending job

E.g. see

• https://github.com/orgs/community/discussions/69704
• https://github.com/orgs/community/discussions/49963

Additional information

No response

[welcome]

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[nguyenalex836]

@rvesse Thanks for opening an issue and linking to your PR! ✨

[erfan125]

hello.go

[kartkbhalodiya]

love my self

[github-actions]

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