Remove quotes around external resource in changing-a-commit-message#commit-has-not-been-pushed-online

[nguyenalex836]

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/pull-requests/committing-changes-to-your-project/creating-and-editing-commits/changing-a-commit-message#commit-has-not-been-pushed-online

This issue is intended for newcomers to the OS Docs repo! 💛

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

You can change the default text editor for Git by changing the core.editor setting. For more information, see "Basic Client Configuration" in the Git manual.

Link to external resource should not have quotation marks per our style guide

Additional information

No response