(DOCSP-34404) Removes warning. (#1502)

Author: erabil-mdb

source/includes/facts/fact-external-domain-spec.rst

@@ -24,11 +24,3 @@ connections still use the hostname with the external domain:
 
 - The {+mdbagent+} to connect to |mongod|.
 - |mongod| to connect to other |mongod| instances.
-
-.. warning::
-
-    Specifying this field changes how |onprem| registers |mongod| processes.
-    You can specify this field only for new replica set deployments starting in |k8s-op-short| 
-    version 1.19. You can't change the value of this field or any ``processes[n].hostname`` fields 
-    in the |onprem| :opsmgr:`automation configuration </reference/cluster-configuration>` for a running
-    replica set deployment.