added a warning not to use 'shift' with hotkeys that trigger animation(s)

updated MANUAL with the changed hotkey

MANUAL

@@ -15,7 +15,7 @@ Right click    Main menu, cancel action
 Middle click   Center on pointer location
 Escape         Exit game, exit menu, cancel message
 ctrl-r         Recruit unit
-ctrl-shift-r   Repeat last recruit
+ctrl-alt-r     Repeat last recruit
 alt-r          Recall unit
 u              Undo last move (only deterministic moves can be undone)
 r              Redo move

data/hotkeys.cfg

@@ -1,3 +1,6 @@
+# Warning:
+# any hotkey that uses shift should not trigger any animation(s) in game since shift toggles accelerated mode
+
 #ifdef APPLE
 [hotkey]
 	command=accelerated