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Please direct your attention to the dot between "gmx" and the underscore afterwards - that's what indicates to modify the extension file. "", not "some.extension.gmx_"

Ideally you'd ask on either itch community or GitHub issues so that other people can find your question later if they have a similar one

Welp, can't believe it was just a typo all this time. Thank you very much!

Is there any way to submit merge requests to the documentation? I couldn't find the directives I asked about, so I would like to help putting them there if possible (even if it means pretty much copy-pasting your explanation).