Updates public document pointer and contribution section to point to mailing list

Signed-off-by: Jeff Scheel <scheel@us.ibm.com>

README.md

@@ -49,8 +49,9 @@ the community mailing list \([syssw-doc_devel_guide@mailinglist.openpowerfoundat
 join the #doc-devel channel in the OpenPOWER Foundation Slack room \([openpowerfoundation.slack.com](https://openpowerfoundation.slack.com/)\).
 
 ## Contributions
-To contribute to the OpenPOWER Foundation template document project, contact Jeff Scheel \([scheel@us.ibm.com](mailto://scheel@us.ibm.com)\) or 
-Jeff Brown \([jeffdb@us.ibm.com](mailto://jeffdb@us.ibm.com)\).
+To contribute to the OpenPOWER Foundation template document project, post patches to the community mailing list
+\([syssw-doc_devel_guide@mailinglist.openpowerfoundation.org](mailto://syssw-doc_devel_guide@mailinglist.openpowerfoundation.org)\) where they
+will be reviewed and approved when ready.
 
 Contributions to this project should conform to the `Developer Certificate
 of Origin` as defined at http://elinux.org/Developer_Certificate_Of_Origin.