bug#9466: 24.0.50; `isearch-query-replace' doc string

[Drew Adams]

Bad English, in a couple of ways.
 
Note that using the prefix arg is possible only when
`isearch-allow-scroll' is non-nil, and it don't always provides the
                                       ^^^^^^^^^^^^^^^^^^^^^^^^
correct matches for `query-replace', so the preferred way to run word
replacements from Isearch is `M-s w ... M-%'.
 

In GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600)
 of 2011-09-05 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.5) --no-opt'