fixes a typo in /code/modules/cargo/packs/ammo.dm (#3752)

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## About The Pull Request
fixes precisely one minor typo
closes #3271 
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## Why It's Good For The Game
fix typo good
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## Changelog

:cl:
fix: fixes a typo in the .45 HP ammo crate's description
/:cl:

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code/modules/cargo/packs/ammo.dm

@@ -97,7 +97,7 @@
 
 /datum/supply_pack/ammo/c45hp_ammo_box
 	name = ".45 HP Ammo Box Crate"
-	desc = "Contains a 48-round 10mm box loaded with hollow point ammo, great against unarmored targets."
+	desc = "Contains a 48-round .45 box loaded with hollow point ammo, great against unarmored targets."
 	contains = list(/obj/item/storage/box/ammo/c45_hp)
 	cost = 500