Remove quotes around external resource in changing-a-commit-message#amending-older-or-multiple-commit-messages

[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#amending-older-or-multiple-commit-messages

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

If you are veteran of the OS Docs repo and are looking for issues to work on, take a look at our help wanted section ✨

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

For more information on interactive rebase, see "Interactive mode" in the Git manual.

Link to external resource should not have quotation marks around them

Additional information

Style guide reference

[Dusch4593]

@nguyenalex836 I opened this PR to fix this issue. 😄