clarify docs

bin/bpatch

@@ -5,11 +5,11 @@
 #
 # Usage:
 #
-#     bpatch hostname
+#     bpatch [user@]hostname [norestart]
 #
-#  hostname  : the hostname of the bubble node to update
-#              Usually you will have an entry in ~/.ssh/config to set the username and ssh key
-#  norestart : If present, do not restart the API server after updating the jar file
+#  [user@]hostname  : the hostname of the bubble node to update. Optionally, also specify a username.
+#                     Usually you will have an entry in ~/.ssh/config to set the username and ssh key
+#  norestart        : If present, do not restart the API server after updating the jar file
 #
 # Patch the bubble.jar on a remote node.
 # This script only works if the only classes that have changed are in the bubble-server codebase.