"repository_dispatch" event shows wrong GITHUB.SHA and GITHUB.REF information

[ba32107]

What article on docs.github.com is affected?

https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows#repository_dispatch

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

The GITHUB_SHA and GITHUB_REF values seem to be wrong. As far as I can tell, there's no way to set a branch when triggering this event from the REST API. This presumption is also confirmed by the fact that the event has the following note:

Note: This event will only trigger a workflow run if the workflow file is on the default branch.

These values should both refer to the default branch. An example of what it should say:
https://docs.github.com/en/free-pro-team@latest/actions/reference/events-that-trigger-workflows#check_run

Additional information

I believe this was a copy-paste error from the workflow_dispatch event.

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