Fixes some typos in the Stamped Steel Machete Crate (#4166)

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## About The Pull Request

This PR fixes a very minor typo with machete crates, and it makes the
description for the quantity of machetes in the crate more accurate.

## Why It's Good For The Game

Ultimately, these very minor errors aren't anything significant, but I
figured it was worth fixing, regardless.

## Changelog

:cl:
fix: fixed a few typos with the machete crate
/:cl:

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code/modules/cargo/packs/sec_supply.dm

@@ -71,8 +71,8 @@
 	crate_name = "survival knife crate"
 
 /datum/supply_pack/sec_supply/machete
-	name = "Stampted Steel Machete Crate"
-	desc = "Contains five mass produced machetes. A perfect choice for crews on a budget."
+	name = "Stamped Steel Machete Crate"
+	desc = "Contains two mass produced machetes. A perfect choice for crews on a budget."
 	cost = 500
 	contains = list(/obj/item/melee/sword/mass,
 					/obj/item/melee/sword/mass)