Delete service description

Author: dandavison

hello_nexus/basic/README.md

@@ -21,8 +21,7 @@ temporal operator namespace create --namespace my-caller-namespace
 temporal operator nexus endpoint create \
   --name my-nexus-endpoint \
   --target-namespace my-target-namespace \
-  --target-task-queue my-target-task-queue \
-  --description-file ./hello_nexus/basic/service_description.md
+  --target-task-queue my-target-task-queue
 ```
 
 In one terminal, run the Temporal worker in the handler namespace: