fixing register order in some instructions

and their use
Arm is confusing as it has result as first arg
we use forward logic, i.e. from -> to

lib/register/instructions/register_transfer.rb

@@ -8,8 +8,14 @@ module Register
   # Get/Set Slot move data around in vm objects, but transfer moves the objects (in the machine)
   #
   # Also it is used for moving temorary data
-  
+  #
+
   class RegisterTransfer < Instruction
+    # initialize with from and to registers.
+    # First argument from
+    # second arguemnt to
+    #
+    # Note: this may be reversed from some assembler notations (also arm) 
     def initialize from , to
       @from = wrap_register(from)
       @to = wrap_register(to)