Add clarification about glob chars in branch/tag matching

[poikilotherm]

What article on docs.github.com is affected?

https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#onpushpull_requestbranchestags

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

https://docs.github.com/en/actions/reference/workflow-syntax-for-github-actions#onpushpull_requestbranchestags

The filter pattern wasn't pointing out that chars in branch names like +, ?, ... need escaping, too. It sounds like * and ** are the only ones. This bit me when doing an exact match for a branch with a + in it's named being ignored for no obvious reason.

Additional information

See https://github.community/t/possible-bug-workflow-not-executed-for-pushes-to-pr-branch-when-base-branch-contains/189446

[welcome]

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[Hatho86]

#8107

[Hatho86]

#8107

[Hatho86]

#8269