bug#23429: 25.0.90; `dired-do-find-regexp' doc string

[Drew Adams]

> >> Should the docstrings mention that some files and subdirectories do get
> >> ignored, according to vc-directory-exclusion-list and
> >> grep-find-ignored-files?
> >
> > I'm not Eli, but yes.
> 
> Would you like to propose the wording?

Presumably something like this (?).

 Files with names matching the values of `vc-directory-exclusion-list'
 or `grep-find-ignored-files' are not searched.

> Should both dired-do-find-regexp and dired-do-find-regexp-and-replace's
> docstrings contain the same sentences for that information?

If the meaning/behavior is the same, why not?