bug#55050: 27.2; Doc strings for commands that do query-replacements

[Drew Adams]

This is about the doc of commands, such as
`dired-do-find-regexp-and-replace', that use a query-replace dialog.
There are a bunch of such commands now.  For the most part, they don't
tell you anything about what to expect, in terms of a dialog.  In
particular, they don't reference the doc of `query-replace`, which is
(at least) where the dialog should be described.

The only saving grace is that there's a prompt that suggests that if you
hit `?' you might get some information about what you can do.  Assuming
you notice that prompt, of course.

The doc of all such commands should, directly or indirectly, tell you
about the keys you can use and what they do - what you learn by hitting
`?'.

See, for example, this user's question:

https://emacs.stackexchange.com/q/71451/105

In GNU Emacs 27.2 (build 1, x86_64-w64-mingw32)
 of 2021-03-26 built on CIRROCUMULUS
Repository revision: deef5efafb70f4b171265b896505b92b6eef24e6
Repository branch: HEAD
Windowing system distributor 'Microsoft Corp.', version 10.0.19043
System Description: Microsoft Windows 10 Pro (v10.0.2009.19043.1586)