bug#4731: 23.1; doc string of `tags-search'

[Lars Magne Ingebrigtsen]

"Drew Adams" <drew.adams@oracle.com> writes:

> Signature: (tags-search REGEXP &optional FILE-LIST-FORM)
>
> Doc string:
>
>  Search through all files listed in tags table for match for regexp.
>  Stops when a match is found.
>  To continue searching for next match, use command M-,.
>  See documentation of variable `tags-file-name'.
>
> The doc string needs to describe the arguments.
> In particular, please describe the FILE-LIST-FORM argument.

I've now added:

If `file-list-form' is non-nil, it should be a form that, when
evaluated, will return a list of file names.  The search will be
restricted to these files.

Which I think is probably correct, looking at where this is being used.

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