brief-yoctoprojectqs, dev-manual: Updated poky clone examples.

The examples in these manuals for checkout of poky by tag need
to be updated immediately after a release.  The reason is that the
examples use recent tags.  I have updated both the examples
that show how to checkout poky based on a specific tag.  This
particular commit makes the YP 2.5.2 release examples correct.
Note, that I use &DISTRO; ENTITY variables to do this but timing
for when they are correct for a release needs to be monitored.

(From yocto-docs rev: 2a3980300465488ef36bf2fc0d034c968ce96e34)

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

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

@@ -881,11 +881,11 @@
                     <literallayout class='monospaced'>
      $ git clone git://git.yoctoproject.org/poky
      Cloning into 'poky'...
-     remote: Counting objects: 367178, done.
-     remote: Compressing objects: 100% (88161/88161), done.
-     remote: Total 367178 (delta 272761), reused 366942 (delta 272525)
-     Receiving objects: 100% (367178/367178), 133.26 MiB | 6.40 MiB/s, done.
-     Resolving deltas: 100% (272761/272761), done.
+     remote: Counting objects: 428741, done.
+     remote: Compressing objects: 100% (101285/101285), done.
+     remote: Total 428741 (delta 320552), reused 428579 (delta 320390)
+     Receiving objects: 100% (428741/428741), 153.04 MiB | 27.16 MiB/s, done.
+     Resolving deltas: 100% (320552/320552), done.
      Checking connectivity... done.
                     </literallayout>
                     Unless you specify a specific development branch or
@@ -1048,11 +1048,11 @@
         .
         .
         .
-     yocto-2.2
-     yocto-2.2.1
-     yocto-2.3
-     yocto-2.3.1
-     yocto-2.4
+     yocto-2.4.4
+     yocto-2.5
+     yocto-2.5.1
+     yocto-2.5.2
+     yocto-2.6
      yocto_1.5_M5.rc8
                     </literallayout>
                     </para></listitem>