Update docs/topics/templates/document-attributes.adoc

Author: anarnold97

docs/topics/templates/document-attributes.adoc

@@ -39,7 +39,7 @@ ifdef::mta[]
 :ocp-short: OpenShift
 :ocp: OCP
 :ocp-version: 4.17
-:ocp-supported: 4.18, 4.17, 4.16
+:ocp-supported: 4.17, 4.16, 4.15
 endif::[]
 
 ifdef::mtr[]