documentation: dev-manual - better terminology.

(From yocto-docs rev: 06f1556d10c75134e53ade7bab407623f00b6a87)

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

documentation/dev-manual/dev-manual-newbie.xml

@@ -687,7 +687,7 @@
                     from an upstream Git 
                     repository and places it in your local Git repository.  
                     You use this command to make sure you are synchronized with the repository 
-                    from which you are basing changes (.e.g. the master repository).</para></listitem>
+                    from which you are basing changes (.e.g. the master branch).</para></listitem>
                 <listitem><para><emphasis><filename>git push</filename>:</emphasis> Sends all your local changes you 
                     have committed to an upstream Git repository (e.g. a contribution repository).  
                     The maintainer of the project draws from these repositories when adding your changes to the