Corrects 200+ instances of "it's" where it should've been "its" instead (#85169)

## About The Pull Request

it's - conjunction of "it" and "is"
its - possessive form of "it"

grammar is hard, and there were a lot of places where "it's" was used
where it shouldn't have been. i went and painstakingly searched the
entire repository for these instances, spending a few hours on it. i
completely ignored the changelog archive, and i may have missed some
outliers. most player-facing ones should be corrected, though
## Why It's Good For The Game
proper grammar is good

## Changelog
🆑
spellcheck: Numerous instances of "it's" have been properly replaced
with "its"
/🆑

code/game/objects/structures/maintenance.dm

@@ -81,7 +81,7 @@ at the cost of risking a vicious bite.**/
 	if(critter_infested && prob(50) && iscarbon(user))
 		var/mob/living/carbon/bite_victim = user
 		var/obj/item/bodypart/affecting = bite_victim.get_bodypart("[(user.active_hand_index % 2 == 0) ? "r" : "l" ]_arm")
-		to_chat(user, span_danger("You feel a sharp pain as an unseen creature sinks it's [pick("fangs", "beak", "proboscis")] into your arm!"))
+		to_chat(user, span_danger("You feel a sharp pain as an unseen creature sinks its [pick("fangs", "beak", "proboscis")] into your arm!"))
 		if(affecting?.receive_damage(30))
 			bite_victim.update_damage_overlays()
 			playsound(src,'sound/weapons/bite.ogg', 70, TRUE)