bug#7676: 24.0.50; incorrect doc about mouse selection

[Drew Adams]

The Emacs manual section about mouse selection (node Mouse Commands) is
out of date.
 
For example:
 
"In addition, the region is copied into the kill ring.
 If you don't want Emacs to copy the region, change the
 variable `mouse-drag-copy-region' to `nil'."

In GNU Emacs 24.0.50.1 (i386-mingw-nt5.1.2600)
 of 2010-12-13 on 3249CTO
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (4.4) --no-opt --cflags
-Ic:/imagesupport/include'