hashFiles() may output empty string when patterns are not matched is not documented

[nikola-jokic]

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/actions/learn-github-actions/expressions#hashfiles

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

I would like to add a sentence that explains that if the pattern does not match, the output would be an empty string. This issue is submitted due to the issue in actions/runner repository:

Additional information

No response