fix summary

Akuli · Akuli · commit f6d5ba2f82f8 · 2016-12-03T00:09:52.000+02:00
diff --git a/using-functions.md b/using-functions.md
@@ -211,10 +211,10 @@ should work normally.
 - `function()` calls a function without any arguments, and
     `function(1, 2, 3)` calls a function with 1, 2 and 3 as arguments.
 - When a function is called, it does something and returns something.
-- `function(stuff)` is "replaced" with the return value in the code
+- `function(arguments)` is "replaced" with the return value in the code
     that called it. For example, `stuff = function()` calls a function,
     and then does `stuff = the_return_value` and the return value ends
-    up in x.
+    up in stuff.
 - Python comes with `print` and `input`. They are built-in functions.
 - Avoid variable names that conflict with built-in functions.
 
