ref-manual: Another round of edits from Paul implemented.

Fixes [YOCTO #2808]

Some small changes to the layer figure and the software
layer wording.

(From yocto-docs rev: 687652a4970910de8a4636999f63ad5c7e861069)

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

documentation/ref-manual/technical-details.xml

@@ -576,7 +576,7 @@
             <title>Software Layer</title>
 
             <para>
-                The software layer provides the Metadata for your
+                The software layer provides the Metadata for additional
                 software packages used during the build.
                 This layer does not include Metadata that is specific to the
                 distribution or the machine, which are found in their
@@ -586,8 +586,6 @@
             <para>
                 This layer contains any new recipes that your project needs
                 in the form of recipe files.
-                If the software layer contains any patch files, they can be
-                stored in a <filename>files</filename> directory.
             </para>
         </section>
     </section>