Fixes a grammar mistake seen in the requisitions vendor. (#5333)

# About the pull request

Fixes a grammar mistake left behind.

# Explain why it's good for the game

Proper English is good and encouraged.

# Testing Photographs and Procedure

No screenshots or videos.

# Changelog

:cl: AnonHault
spellcheck: fixed a typo
/:cl:

code/game/machinery/vending/vendor_types/requisitions.dm

@@ -50,7 +50,7 @@
 		list("M40 HPDP White Phosphorus Smoke Grenade", round(scale * 4), /obj/item/explosive/grenade/phosphorus, VENDOR_ITEM_REGULAR),
 		list("M40 HSDP Smoke Grenade", round(scale * 5), /obj/item/explosive/grenade/smokebomb, VENDOR_ITEM_REGULAR),
 		list("M74 AGM-Frag Airburst Grenade", round(scale * 4), /obj/item/explosive/grenade/high_explosive/airburst, VENDOR_ITEM_REGULAR),
-		list("M74 AGM-Icendiary Airburst Grenade", round(scale * 4), /obj/item/explosive/grenade/incendiary/airburst, VENDOR_ITEM_REGULAR),
+		list("M74 AGM-Incendiary Airburst Grenade", round(scale * 4), /obj/item/explosive/grenade/incendiary/airburst, VENDOR_ITEM_REGULAR),
 		list("M74 AGM-Smoke Airburst Grenade", round(scale * 4), /obj/item/explosive/grenade/smokebomb/airburst, VENDOR_ITEM_REGULAR),
 		list("M74 AGM-Star Shell", round(scale * 2), /obj/item/explosive/grenade/high_explosive/airburst/starshell, VENDOR_ITEM_REGULAR),
 		list("M74 AGM-Hornet Shell", round(scale * 4), /obj/item/explosive/grenade/high_explosive/airburst/hornet_shell, VENDOR_ITEM_REGULAR),