Adds a tooltip to airlocks with papers because I was mildly inconvenienced by a rude message on my door once (#90987)

## About The Pull Request and why it's good for the game

See name.


![image](https://github.com/user-attachments/assets/0f023a29-f995-410a-b76c-0f539df8babf)


## Why It's Good For The Game

It's literally the bare minimum QoL for something that isn't stated
anywhere but the code directly and I enjoy not having to alt tab and
code dive for the smallest, nichest interaction.
## Changelog
🆑
qol: Notes on airlocks now tell you how they can be removed on examine
/🆑

---------

Co-authored-by: John Willard <53777086+JohnFulpWillard@users.noreply.github.com>

code/game/machinery/doors/airlock.dm

@@ -648,6 +648,7 @@
 		else
 			. += "There's a [note.name] pinned to the front..."
 			. += note.examine(user)
+		. += span_notice("The attached [note.name] can be taken down with some [EXAMINE_HINT("wirecutters")].")
 	if(seal)
 		. += "It's been braced with \a [seal]."
 	if(welded)