[PATCH] Retitle 'inspecting what happened' section.

[PATCH] Retitle 'inspecting what happened' section.

In the tutorial, there is a section entitled "Checking it out"
that shows how to use diff log and whatchanged to insect some
of the repository state.

As the phrase "checkout" ususally carries some baggage WRT
other revision control mechanism, I suggest that we re-title
this section something like "Inspecting Changes".

Signed-off-by: Jon Loeliger <jdl@freescale.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>