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/water_structures/sink.dm

@@ -14,7 +14,7 @@
 	var/buildstacktype = /obj/item/stack/sheet/iron
 	///Number of sheets of material to drop when broken or deconstructed.
 	var/buildstackamount = 1
-	///Does the sink have a water recycler to recollect it's water supply?
+	///Does the sink have a water recycler to recollect its water supply?
 	var/has_water_reclaimer = TRUE
 	///Units of water to reclaim per second
 	var/reclaim_rate = 0.5