bug#37538: [PATCH] Add docstring for `tags-complete-tags-table-file'.

[Lars Ingebrigtsen]

Hong Xu <hong@topbug.net> writes:

> Would the following docstring work for you (will be reformatted)?
> Because the function accepts the same arguments as the one documented
> in `(elisp) Programmed Completion', I thought it should be
> understandable that WHAT refers to the third argument.
>
> The meaning of the arguments are the same as the function form of
> COLLECTION as explained in Info node `(elisp) Programmed
> Completion', except that if the third parameter (WHAT) does not equal
> t, it is treated
> as if it were nil.

The problem is that `(elisp) Programmed Completion' (at least in Emacs
27) doesn't mention a WHAT parameter at all, so it's unclear what this
refers to.

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