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/modules/mining/ores_coins.dm

@@ -406,7 +406,7 @@ GLOBAL_LIST_INIT(sand_recipes, list(\
 
 /*****************************Coin********************************/
 
-// The coin's value is a value of it's materials.
+// The coin's value is a value of its materials.
 // Yes, the gold standard makes a come-back!
 // This is the only way to make coins that are possible to produce on station actually worth anything.
 /obj/item/coin