Github Actions context variables data format not precise

[tillepille]

What article on docs.github.com is affected?

https://docs.github.com/en/free-pro-team@latest/actions/reference/context-and-expression-syntax-for-github-actions

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

Be more precise about the data format on github.ref like on https://docs.github.com/en/free-pro-team@latest/actions/reference/environment-variables

I thought I could use it as a tag for a docker build but this does not work.

Additional information

PR already opened

[welcome]

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[janiceilene]

Thank you for opening an issue @tillepille!