Fixed grammar under function "get_arguments" (#3152)

archinstall/__init__.py

@@ -174,7 +174,7 @@ def get_arguments() -> dict[str, Any]:
 	0) we create a dict to store the arguments and their values
 	1) preprocess.
 		We take those arguments which use JSON files, and read them into the argument dict. So each first level entry
-		becomes a argument on it's own right
+		becomes an argument on its own right
 	2) Load.
 		We convert the predefined argument list directly into the dict via the vars() function. Non specified arguments
 		are loaded with value None or false if they are booleans (action="store_true"). The name is chosen according to