Tidied up some outdated docs

Author: audigex

docs/BRTrainsV2_UnitsAndLiveries.txt

@@ -10,8 +10,8 @@ Mk2 DBSO: 47, 57?, 37
 
 Mk3 DVT: *86, *87, *90, *67, *68, 47*, 57?, 69?
 
-Mk4 DVT: *67, *89, *90, 91
+Mk4 DVT: *67, *89, *90, *91
 
-Mk5 DVT: *68 (Done as a fixed-consist 68 + Mk5 set)
+Mk5 DVT: *68
 
 438 TC: 33, 73, 71 (& 74 converted from 71), 4-REP (432). Maybe 47 (unconfirmed if push-pull or just hauled for a railtour)