docs: clarify path filters for changes to git submodule files

[sushant-me]

Closes #44228. Adds a note to \on.<push|pull_request|pull_request_target>.<paths|paths-ignore>\ clarifying that to detect changes to files inside a git submodule, you should filter on the path to the top-level submodule rather than paths within the submodule.

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actions/reference/workflows-and-actions/workflow-syntax.md	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.22 3.21 3.20 3.19 3.18 3.17

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[subatoi]

Thanks for submitting a PR, @sushant-me — we'll consider this in the context of the original issue, but since that wasn't approved for user contributions I'm unable to review this at this time. I'm happy to leave this open, but I'd also note that the original contributor may prefer to raise their own PR in the event that a contribution's approved. Thank you

[sushant-me]

Thanks @subatoi — that is a clear answer, and I appreciate you taking the time to give it rather than leaving it hanging.

I will leave this open, since you said you are happy to. If it is ever cleaner to close it, or to have the original contributor carry the change themselves, just say so and I will do either straight away — the edit is small and self-contained, so porting it across is cheap and nothing here is worth holding up.

Thanks again for the clear process answer.