documentation: Moved "Git" section to the ref-manual

Fixes [YOCTO #11630]

The "Git" section in the dev-manual is really about concepts.
There are a couple of examples that might or not might be
allowed to ultimately stay.  I have moved the section to the
ref-manual.  If those examples get replicated in the new
dev-manual, I will update the "Git" section further.  For now,
however, these remain in this moved section.

(From yocto-docs rev: 2e4b87fdab29c13ce0d2314e50c93e37404b6f7e)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/kernel-dev/kernel-dev-examples.xml

@@ -241,8 +241,8 @@
             You can find Git documentation at
             <ulink url='http://git-scm.com/documentation'></ulink>.
             You can find a simple overview of using Git with the Yocto Project in the
-            "<ulink url='&YOCTO_DOCS_DEV_URL;#git'>Git</ulink>"
-            section of the Yocto Project Development Manual.
+            "<ulink url='&YOCTO_DOCS_REF_URL;#git'>Git</ulink>"
+            section of the Yocto Project Reference Manual.
         </para>
 
         <section id='change-inspection-kernel-changes-commits'>