rework manual to have it up to date with the latest multiplayer login stuff

doc/manual/manual.txt

@@ -94,7 +94,7 @@ your language; then click the "Tutorial" button to run the tutorial;
 and then play the campaign, "A Tale of Two Brothers" by clicking the "Campaign"
 button and selecting it from the list provided.
 
-image:images/main-menu-1.5.7.jpg["Main Menu"]
+image:images/main-menu-1.5.11.jpg["Main Menu"]
 
 Tutorial::
  The tutorial is a real, but basic, game which teaches you some of
@@ -225,22 +225,17 @@ possible only within the scenario.
 There are several possible options you are provided with when clicking on the
 "Multiplayer" button:
 
-image:images/multiplayer-1.5.9.jpg["Multiplayer dialog"]
+image:images/multiplayer-1.5.11.jpg["Multiplayer dialog"]
 
 Login
 +++++
 
 This will be your name on the multiplayer server. If you have an account on the
 http://www.wesnoth.org/forum[Wesnoth forums], you may use the same username and
-password for joining the official server. You cannot use a registered name
+password for joining the official server. A password box will pop up if a
+password is required for the current username. You cannot use a registered name
 without the password.
 
-Password
-++++++++
-
-You only need to supply a password when you wish to use a registered username.
-In all other cases, just leave it blank.
-
 Join official Server
 ++++++++++++++++++++