Update service.md

Author: AlphaWong

content/en/docs/concepts/services-networking/service.md

@@ -550,7 +550,7 @@ spec:
       # By default and for convenience, the `targetPort` is set to the same value as the `port` field.
       nodePort: 30007
       # Optional field
-      # By default and for convenience, the Kubernetes control plane will allocates a port from a range (default: 30000-32767)
+      # By default and for convenience, the Kubernetes control plane will allocate a port from a range (default: 30000-32767)
 ```
 
 ### Type LoadBalancer {#loadbalancer}