Update sample_config.yaml

docs/sample_config.yaml

@@ -1058,7 +1058,7 @@ account_threepid_delegates:
     #msisdn: http://localhost:8090  # Delegate SMS sending to this local process
 
 # If disabled, don't let users set their own display names/avatars
-# other than for the very first time (unless they are a server admin).
+# (unless they are a server admin) other than for the very first time.
 # Useful when provisioning users based on the contents of a 3rd party
 # directory and to avoid ambiguities.
 #