Update troubleshoot-workflows.md to mention manual workflow dis/enabling

[jenstroeger]

Why:

I spent several hours trying to understand why a workflow didn’t trigger — the yml seemed ok (it was!) and the PRs seemed ok (they were!) and yet workflows didn’t trigger. I was utterly befuddled until by pure dumb luck I stumbled upon the disabled badge on the workflow in the Actions tab.

I think it makes sense to mention manual workflow dis/enabling here in the troubleshooting section?

What's being changed (if available, include any code snippets, screenshots, or gifs):

Added one line of text.

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actions/how-tos/troubleshoot-workflows.md	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17

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[Sharra-writes]

@jenstroeger Yeah, this seems like a good addition. I'll get it approved.

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