Fix English in domains.md.

Author: Tom Barnes

site/domains.md

@@ -73,7 +73,7 @@ running in Kubernetes.
   hyphen and then the server name, all lower case, and underscores converted to dashes.  For example, if `domainUID=domain1` and
   the WebLogic server name is `Admin_Server`, then its listen address becomes `domain1-admin-server`. 
 * _Domain, Cluster, Server, and Network-Access-Point Names:_ WebLogic domain, cluster, server, and network-access-point (channel)
-  names must contain only the characters `A-Z`, `a-z`, `0-9`, `-`, or `_`.  This ensures they can be converted to 
+  names must contain only the characters `A-Z`, `a-z`, `0-9`, `-`, or `_`.  This ensures that they can be converted to 
   meet Kubernetes resource and DNS1123 naming requirements.  (When generating pod and service names, the operator will convert
   configured names to lower case and substitute `-` for each `_`.)
 * _Node Ports:_ If you choose to expose any WebLogic channels outside the Kubernetes cluster via a `NodePort`, for example, the