Inconsistent HTTP headers name

[akordowski]

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?

Multiple articles.

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

There are occurrences where HTTP headers X-GitHub- are written as X-Github-.

There are also two HTTP mentioned, which don't have the X- prefix (e.g. here):

• Github-Public-Key-Identifier
• Github-Public-Key-Signature

Additional information

I can provide a PR with fixes.

[akordowski]

In the provided PR I fixed only the X-GitHub- headers. I was unsure if the headers Github-Public-Key-Identifier and Github-Public-Key-Signature should be fixed as well.