bug#7845: 24.0.50; doc string of `fill-region'

[Drew Adams]

"Ordinarily the variable `fill-column' controls the width."
 
What is "ordinarily" - or rather, when does `fill-column' not control
the width?  Is there some other way to control the width (other than
binding or setting `fill-column')?  The Emacs manual (node `Fill
Commands') seems to confirm that playing with `fill-column' is the
(only) way to control the width.
 

In GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600)
 of 2011-01-03 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4) --no-opt --cflags
-Ic:/imagesupport/include'