Use backticks to format file name in working-with-the-npm-registry#installing-a-package

[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/packages/working-with-a-github-packages-registry/working-with-the-npm-registry#installing-a-package

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 also need to add the .npmrc file to your project so that all requests to install packages will go through GitHub Packages.

Use backticks to format references to the file names per our style guide

Additional information

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