Corrected s/S in SNO attribute

Author: amolnar-rh

_attributes/common-attributes.adoc

@@ -133,8 +133,8 @@ endif::[]
 :ibmzProductName: IBM Z
 // Red Hat Quay Container Security Operator
 :rhq-cso: Red Hat Quay Container Security Operator
-:sno: single-node Openshift
-:sno-caps: Single-node Openshift
+:sno: single-node OpenShift
+:sno-caps: Single-node OpenShift
 //TALO and Redfish events Operators
 :cgu-operator-first: Topology Aware Lifecycle Manager (TALM)
 :cgu-operator-full: Topology Aware Lifecycle Manager