Clarify version selection in README

This commit helps usher users into selecting the correct
release for them.

README.md

@@ -16,20 +16,27 @@ tracked by
 [#2720](https://github.com/openshift/openshift-ansible/issues/2720).
 
 ## Getting the correct version
+When choosing an openshift release, ensure that the necessary origin packages
+are available in your distribution's repository.  By default, openshift-ansible
+will not configure extra repositories for testing or staging packages for
+end users.
 
-The
+We recommend using a release branch. We maintain stable branches
+corresponding to upstream Origin releases, e.g.: we guarantee an
+openshift-ansible 3.2 release will fully support an origin
+[1.2 release](https://github.com/openshift/openshift-ansible/tree/release-1.2).
+
+The most recent branch will often receive minor feature backports and
+fixes. Older branches will receive only critical fixes.
+
+In addition to the release branches, the master branch
 [master branch](https://github.com/openshift/openshift-ansible/tree/master)
 tracks our current work **in development** and should be compatible
 with the
 [Origin master branch](https://github.com/openshift/origin/tree/master)
 (code in development).
 
-In addition to the master branch, we maintain stable branches
-corresponding to upstream Origin releases, e.g.: we guarantee an
-openshift-ansible 3.2 release will fully support an origin
-[1.2 release](https://github.com/openshift/openshift-ansible/tree/release-1.2).
-The most recent branch will often receive minor feature backports and
-fixes.  Older branches will receive only critical fixes.
+
 
 **Getting the right openshift-ansible release**