[RFC PATCH] Documentation: diff produces patches, which can be 'apply'd

This attached patch (my first) suggests a couple of small documenation changes for 'diff' based on Junio's supportive comments at
http://article.gmane.org/gmane.comp.version-control.git/197282

The purpose of the patch is to make users aware of the apply command as a companion to diff.

If changing the NAME text is considered inappropriate, the same change could just as easily be applied to the start of the 
DESCRIPTION.

I haven't sorted out using 'send-mail' for patches yet, so I've attached it.
The patch was generated with "git format-patch -M" as per directions.
The patch was on top of tag v1.7.10.msysgit.0 from https://github.com/msysgit/git

Comments?

Philip