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"
/🆑

tgui/docs/chat-embedded-components.md

@@ -29,7 +29,7 @@ We can't embed components that haven't been prewhitelisted.
 This isn't because of security concerns or anything, we just can't lookup components by their name without creating a lookup table.
 You can find that in [tgui chat's renderer](../packages/tgui-panel/chat/renderer.js) under the name `TGUI_CHAT_COMPONENTS`
 
-Adding a new component is simple, just add it's name to the dictionary, and import it into the file.
+Adding a new component is simple, just add its name to the dictionary, and import it into the file.
 
 ### Sending props
 
@@ -38,7 +38,7 @@ Ok, so we know how to render a component, but that's nearly useless unless we al
 So how's that work?
 
 The syntax is similar to sending a component, but has a bit more caveats.
-We have two bits of info to contend with. The name of the prop, and it's value.
+We have two bits of info to contend with. The name of the prop, and its value.
 First then, how do you send the name of a prop?
 
 #### Sending a prop's name