update typical patch session notes

src/CommandFormats.hh

@@ -88,6 +88,10 @@ struct ClientConfigBB {
 // Client: 02
 // Server: 04
 // Client: 04
+// If client's login information is wrong and server chooses to reject it:
+//   Server: 15
+//   Server disconnects
+// Otherwise:
 //   Server: 13 (if desired)
 //   Server: 0B
 //   Server: 09 (with directory name ".")
@@ -112,6 +116,7 @@ struct ClientConfigBB {
 //         Server: 08
 //       Server: 0A
 //   Server: 12
+//   Server disconnects
 
 // 00: Invalid command
 // 01: Invalid command