brief-yoctoprojectqs: Added "tip" to use mirrors to speed build.

(From yocto-docs rev: 4088481f081e4746da4a774648a59d6ec31439b7)

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

documentation/brief-yoctoprojectqs/brief-yoctoprojectqs.xml

@@ -228,11 +228,25 @@
                     <filename>local.conf</filename> becomes available in
                     a <filename>conf</filename> subdirectory of the
                     Build Directory.
-                    For this quick start, the defaults are set to build
+                    For this example, the defaults are set to build
                     for a <filename>qemux86</filename> target, which is
                     suitable for emulation.
                     The package manager used is set to the RPM package
                     manager.
+                    <tip>
+                        You can significantly speed up your build and guard
+                        against fetcher failures by using mirrors.
+                        To use mirrors, add these lines to your
+                        <filename>local.conf</filename> file in the Build
+                        directory:
+                        <literallayout class='monospaced'>
+     SSTATE_MIRRORS = "\
+     file://.* http://sstate.yoctoproject.org/dev/PATH;downloadfilename=PATH \n \
+     file://.* http://sstate.yoctoproject.org/2.3/PATH;downloadfilename=PATH \n \
+     file://.* http://sstate.yoctoproject.org/2.4/PATH;downloadfilename=PATH \n \
+     "
+                        </literallayout>
+                    </tip>
                     </para></listitem>
                 <listitem><para>
                     <emphasis>Start the Build:</emphasis>