Undocumented limitation on builtin generic hook names about latex2e HOT 3 OPEN

I'm fairly sure that in several places in the LaTeX documentation environments are documented as restricted to [a-zA-Z]+ most likely in Lamport already. Now we know that this isn't quite true and that you can use further characters with different success rate but that doesn't mean this this is officially supported behavior.

I therefore don't think that generic hooks should attempt to do anything about it nor that on the level of the hook documentation it shoud be called out especially. Anybody who attempts to use such a generic hook for envs should be able to realize that it is impossible for the software to identify if a / is part of an environment name or indicates a different level in the hook name.

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Documentation on environments according to Lamport: the "name" of the environment can be any sequence of letters, numbers, and the character * that do not begin with "end".

Letters in this context is defined by [a-zA-Z] but that should also be clear by calling out the only other allowed character: *

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