GH38823: Fixed typo in namespace selector label for OpenShift SDN

Author: Christopher Tauchen

modules/nw-networkpolicy-multitenant-isolation.adoc

@@ -43,7 +43,7 @@ spec:
   - from:
     - namespaceSelector:
         matchLabels:
-          policy-group.network.openshift.io/ingress="" 
+          policy-group.network.openshift.io/ingress: ""
   podSelector: {}
   policyTypes:
   - Ingress
@@ -52,7 +52,7 @@ EOF
 +
 [NOTE]
 ====
-`policy-group.network.openshift.io/ingress=""` is the preferred namespace selector label for OpenShift SDN. You can use the `network.openshift.io/policy-group: ingress` namespace selector label, but this is a legacy label. 
+`policy-group.network.openshift.io/ingress: ""` is the preferred namespace selector label for OpenShift SDN. You can use the `network.openshift.io/policy-group: ingress` namespace selector label, but this is a legacy label.
 ====
 .. A policy named `allow-from-openshift-monitoring`:
 +