Fixed the wrong name of building image. According to the implementation and running behavior. the building image is openshift/origin-release

Author: linzhaoming

CONTRIBUTING.adoc

@@ -46,7 +46,7 @@ https://github.com/openshift/origin[origin repo].
 
 You can develop OpenShift on Windows, Mac, or Linux, but you'll need Docker
 installed on Linux to actually launch containers. Client and server binaries
-can be built locally or in the `openshift/release` container environment. The
+can be built locally or in the `openshift/origin-release` container environment. The
 http://golang.org/[Go] programming language is only necessary for building on
 the local host.
 

HACKING.md

@@ -37,7 +37,7 @@ We generally cut a release before disruptive changes land.
 
 ### Building on Non-Linux Systems
 
-We provide the `openshift/release` container in which all of our build
+We provide the `openshift/origin-release` container in which all of our build
 dependencies live, so that one can build a full release of OpenShift without
 having to install anything other than a container runtime on their local system.
 To run scripts or `make` targets from the Origin repo inside of the container,