OSOCS-12556: fixes duplicate parameter entry

Author: ShaunaDiaz

modules/microshift-disconnected-host-procedure.adoc

@@ -72,7 +72,7 @@ $ echo "$IP $NAME" | sudo tee -a /etc/hosts >/dev/null
 ----
 sudo tee /etc/microshift/config.yaml > /dev/null <<EOF
 node:
-  hostnameOverride: hostnameOverride: $(echo $NAME)
+  hostnameOverride: $(echo $NAME)
   nodeIP: $(echo $IP)
 EOF
 ----