Clarify instructions on divide (JS-Challenges#63)

* Clarify instructions on divide

Previously it was not clear that the prompt was seeking
an approximate quotient, as opposed to a precise one.

* Remove spaces in word 'function'

DOH!

Author: TwoFistedJustice

src/recursion.js

@@ -71,7 +71,7 @@ var multiply = function(x, y) {
 };
 
 // 13. Write a function that divides two numbers without using the / operator or
-// Math methods.
+// Math methods to arrive at an approximate quotient (ignore decimal endings).
 var divide = function(x, y) {
 };