Merge pull request openshift#8122 from warmchang/buildah

Aha, it should be Buildah.

Author: ahardin-rh

release_notes/ocp_3_9_release_notes.adoc

@@ -157,8 +157,8 @@ nodes], and others are only running `docker`.
 See the link:http://cri-o.io/[upstream documentation] for more information on
 CRI-O.
 
-[[ocp-39-buildha]]
-==== Buildha
+[[ocp-39-buildah]]
+==== Buildah
 
 Buildah is fully supported with RHEL 7.5.