dietgo.cpp, tattack.cpp, vsmjtria.cpp: very minor comment updates

src/mame/drivers/dietgo.cpp

@@ -8,6 +8,7 @@
 Hold both START buttons on bootup to display version notice.
 
 Diet Go Go (Japan)   DATA EAST
+DE-0370-2
 
 NAME    LOCATION   TYPE
 -----------------------

src/mame/drivers/tattack.cpp

@@ -27,7 +27,7 @@
     - outputs (coin counter port same as sound writes?);
     - hook up pots, some are useful for in-game adjustments such as paddle adjust and ball shape (ball is currently a rectangle).
     - hook up background color jumper (can be changed to black or blue)
-    - player bat moves in steps. It this correct compared to real PCB?
+    - player bat moves in steps. Is this correct compared to real PCB?
     - sound (Music requires Epson 7910CQ Multi-Melody ROM & emulation)
     \- victory BGM cuts off too late?
 

src/mame/drivers/vsmjtria.cpp

@@ -2,7 +2,7 @@
 // copyright-holders:
 
 /*
-VS Mahjong Triangle (c) 1986? Dyna
+VS Mahjong Triangle (c) 1986 Dyna
 
 Unmarked board with everything doubled up, to provide a versus experience with a single board
 2 players can play separately or one against the other
@@ -579,4 +579,4 @@ void vsmjtria_state::init_vsmjtria()
 } // Anonymous namespace
 
 
-GAME( 1986?, vsmjtria, 0, vsmjtria, vsmjtria, vsmjtria_state, init_vsmjtria, ROT0, "Dyna", "VS Mahjong Triangle", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE ) // puts Home Data in RAM? coins and CPU comms not working
+GAME( 1986, vsmjtria, 0, vsmjtria, vsmjtria, vsmjtria_state, init_vsmjtria, ROT0, "Dyna", "VS Mahjong Triangle", MACHINE_NOT_WORKING | MACHINE_SUPPORTS_SAVE ) // puts Home Data in RAM? coins and CPU comms not working