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/datums/components/object_possession.dm

@@ -8,7 +8,7 @@
 	/**
 	  * back up of the real name during user possession
 	  *
-	  * When a user possesses an object it's real name is set to the user name and this
+	  * When a user possesses an object its real name is set to the user name and this
 	  * stores whatever the real name was previously. When possession ends, the real name
 	  * is reset to this value
 	  */