[bug #66096] document behavior of multiple .hw calls

[Dave]

Follow-up Comment #4, bug #66096 (group groff):

[comment #3 comment #3:]
> from the user's perspective, unless we give them a reason to
> think otherwise, they are free to assume that hyphenation words
> are stored in the same way that registers and strings are.

A user thinking along these lines might observe, "Setting the same register to
a new value overwrites the old value; so by analogy, giving .hw a new list
should overwrite the old list."

There's an additional reason they might suspect this: the combination of (a)
the essential nature of the request: it's the sort of data that typically
needs to be set once, probably near the start of a document; and (b) the
syntax of the request, which takes as many arguments as a user cares to give
it.  And nothing about the request even implies that this list is stored in
the same way that registers and strings are: those each have unique names,
implying (multiple) unique slots.

I might be an outlier in thinking these are factors that might make a reader
wonder, so a third opinion might be in order.


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