removes dead comment

code/__DEFINES/atmospherics.dm

@@ -37,8 +37,6 @@
 #define GAS_TYPE_PHORON "phoron"
 #define GAS_TYPE_CO2 "carbon dioxyde"
 
-/// This was a define, but I changed it to a variable so it can be changed in-game.(kept the all-caps definition because... code...) -Errorage
-
 /// Used in /obj/structure/pipes/vents/proc/create_gas
 #define VENT_GAS_SMOKE "Smoke"
 #define VENT_GAS_CN20 "CN20 Nerve Gas"