Add Spellcheck in build process (and fix spelling issues)

[SeanKilleen]

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?

The overall GitHub docs site; no one particular article

What changes are you suggesting?

• Fix spelling errors that currently exist
• Introduce spellcheck for every docs PR build

Additional information

This issue is to ensure there's an associated issue for the PR I'm proposing.

[welcome]

Thanks for opening this issue. A GitHub docs team member should be by to give feedback soon. In the meantime, please check out the contributing guidelines.

[cmwilson21]

@SeanKilleen - Thank you for opening an issue and linking it to your PR! ✨

[github-actions]

A stale label has been added to this issue becuase it has been open for 60 days with no activity. To keep this issue open, add a comment within 3 days.

[SeanKilleen]

Adding a comment to bump this as the PR and associated work is still in active development and discussion is happening there.

[github-actions]

A stale label has been added to this issue becuase it has been open for 60 days with no activity. To keep this issue open, add a comment within 3 days.

[SeanKilleen]

Glad that during the course of this issue we were able to make 80 changes to the docs. I hope they prove helpful!

[cmwilson21]

They were a ton of help! Thank you for all the improvements and PRs you submitted. We appreciate your contributions and look forward to more in the future 💖