brief-yoctoprojectqs: Added link to "OpenEmbedded build system" term.

(From yocto-docs rev: a7a5dc58b1f66cf270d737fa6ddd447364cf77c1)

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

documentation/brief-yoctoprojectqs/brief-yoctoprojectqs.xml

@@ -157,8 +157,10 @@
 
         <para>
             Use the following steps to build your image.
-            The OpenEmbedded build system creates an entire Linux
-            distribution, including the toolchain, from source.
+            The
+            <ulink url='&YOCTO_DOCS_REF_URL;#build-system-term'>OpenEmbedded build system</ulink>
+            creates an entire Linux distribution, including the toolchain,
+            from source.
             <note>
                 <itemizedlist>
                     <listitem><para>