brief-yoctoprojectqs: Added more detail about layer greatness.

(From yocto-docs rev: 935497e3d3a39cdc5eadcdd790466e3d18a65f25)

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

documentation/brief-yoctoprojectqs/brief-yoctoprojectqs.xml

@@ -285,8 +285,15 @@
         <para>
             A hardware layer provides the metadata to support specific
             hardware.
-            By convention, hardware layers (i.e. Board Support Packages)
-            start with the string "meta-".
+            In general, layers are repositories that contain related sets
+            of instructions and configurations that tell the OpenEmbedded
+            build system what to do.
+            Isolating related metadata into layers facilitates modular
+            development.
+            <note>
+                By convention, hardware layers (i.e. Board Support Packages)
+                start with the string "meta-".
+            </note>
         </para>
 
         <para>