ref-manual: Updated "Contributions" section

There is a cross-reference to the "How to Submit a Change"
section.  I added a bit of text to note that the ready can
go there to find out who maintains code.

(From yocto-docs rev: 30a2602c4c0945f1c9bd2a7fa71c1b98e790b2eb)

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

documentation/ref-manual/resources.xml

@@ -112,9 +112,11 @@
 
     <para>
         The Yocto Project gladly accepts contributions.
-        You can submit changes to the project either by creating and sending pull requests,
+        You can submit changes to the project either by creating and sending 
+        pull requests,
         or by submitting patches through email.
-        For information on how to do both, see the
+        For information on how to do both as well as information on how
+        to find out who is the maintainer for areas of code, see the
         "<ulink url='&YOCTO_DOCS_DEV_URL;#how-to-submit-a-change'>How to Submit a Change</ulink>"
         section in the Yocto Project Development Manual.
     </para>