dev-manual; brief-yoctoprojectqs: Updated checkout branch example

Added the "yocto-2.6.2" tag to the example output since that
will be part of the overal list when 2.7 releases.

(From yocto-docs rev: 4863284811ad459cb0193528d5686a1ec008bb3e)

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

documentation/brief-yoctoprojectqs/brief-yoctoprojectqs.xml

@@ -174,6 +174,7 @@
      yocto-2.5.2
      yocto-2.6
      yocto-2.6.1
+     yocto-2.6.2
      yocto-2.7
      yocto_1.5_M5.rc8
             </literallayout>

documentation/dev-manual/dev-manual-start.xml

@@ -1113,6 +1113,7 @@
      yocto-2.5.3
      yocto-2.6
      yocto-2.6.1
+     yocto-2.6.2
      yocto-2.7
      yocto_1.5_M5.rc8
                     </literallayout>