bug#20194: 25.0.50; doc strings of `dired-do-search' and similar

[Drew Adams]

The doc strings of such commands should say that if no files are marked
then the file of the current line is acted on.

Yes, this is standard procedure for Dired.  But someone checking out
what `A' or `Q' (or an equivalent menu item) does might not be aware of
this.  It doesn't hurt to add a few words to let them know.


In GNU Emacs 25.0.50.1 (i686-pc-mingw32)
 of 2014-10-20 on LEG570
Bzr revision: 118168 rgm@gnu.org-20141020195941-icp42t8ttcnud09g
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --enable-checking=yes,glyphs CPPFLAGS=-DGLYPH_DEBUG=1'