documentation/dev-manual/dev-manual-kernel-appendix.xml: Fix example

The exmample that sets up poky-extras was not putting the user
in the proper directory.  I updated the cd command to place them
in poky-extras before checking out the branch.

(From yocto-docs rev: 4860ddacc1fc593e0c5b48b399638ab1ecdb1f94)

Signed-off-by: Scott Rifenbark <scott.m.rifenbark@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

documentation/dev-manual/dev-manual-kernel-appendix.xml

@@ -180,18 +180,18 @@
                 From inside the repository you can see the branch names and the tag names used 
                 in the Git repository using either of the following two commands:
                 <literallayout class='monospaced'>
-     $ cd poky
+     $ cd poky/poky-extras
      $ git branch -a
      $ git tag -l
                 </literallayout> 
-                This example uses the Yocto Project 1.1.1 Release code named "edison", 
+                This example uses the Yocto Project &DISTRO; Release code named "&DISTRO_NAME;", 
-                which maps to the <filename>edison</filename> branch in the repository. 
+                which maps to the <filename>&DISTRO_NAME;</filename> branch in the repository. 
-                The following commands create and checkout the local <filename>edison</filename>
+                The following commands create and checkout the local <filename>&DISTRO_NAME;</filename>
                 branch:
                 <literallayout class='monospaced'>
-     $ git checkout -b edison origin/edison
+     $ git checkout -b &DISTRO_NAME; origin/&DISTRO_NAME;
-     Branch edison set up to track remote branch edison from origin.
+     Branch &DISTRO_NAME; set up to track remote branch &DISTRO_NAME; from origin.
-     Switched to a new branch 'edison'
+     Switched to a new branch '&DISTRO_NAME;'
                 </literallayout>
             </para>
         </section>