[MIRROR] Various grammar fixes (#2842)

* Various grammar fixes

* Update mecha_parts.dm

* Update crates.dm

* Update ghost_role_spawners.dm

* Update paper_premade.dm

* Update oldstation.dm

code/datums/action.dm

@@ -421,7 +421,7 @@
 
 /datum/action/item_action/ninjapulse
 	name = "EM Burst (25E)"
-	desc = "Disable any nearby technology with a electro-magnetic pulse."
+	desc = "Disable any nearby technology with an electro-magnetic pulse."
 	button_icon_state = "emp"
 	icon_icon = 'icons/mob/actions/actions_spells.dmi'
 

code/datums/callback.dm

@@ -131,7 +131,7 @@
 
 //runs a list of callbacks asynchronously, returning once all of them return.
 //callbacks can be repeated.
-//callbacks-args is a optional list of argument lists, in the same order as the callbacks,
+//callbacks-args is an optional list of argument lists, in the same order as the callbacks,
 //	the inner lists will be sent to the callbacks when invoked() as additional args.
 //can optionly save and return a list of return values, in the same order as the original list of callbacks
 //resolution is the number of byond ticks between checks.

code/datums/ruins/space.dm

@@ -148,7 +148,7 @@
 	id = "spacehotel"
 	suffix = "spacehotel.dmm"
 	name = "The Twin-Nexus Hotel"
-	description = "A interstellar hotel, where the weary spaceman can rest their head and relax, assured that the residental staff will not murder them in their sleep. Probably."
+	description = "An interstellar hotel, where the weary spaceman can rest their head and relax, assured that the residental staff will not murder them in their sleep. Probably."
 
 /datum/map_template/ruin/space/turreted_outpost
 	id = "turreted-outpost"