Number type fix

According to the *Good Parts*, there is actually no difference between `integer` and `floating point` numbers in JavaScript.

numbers/README.md

@@ -1,7 +1,5 @@
 # Numbers
 
-JavaScript has only one type of numbers, it does not define different types of numbers, like integers, short, long, floating-point etc. A number could be a **Float** (ex: 1.23) or an **Integer** (ex: 10).
+JavaScript has **only one type of numbers** – 64-bit float point. It's the same as Java's `double`. Unlike most other programming languages, there is no separate integer type, so 1 and 1.0 are the same value.
 
-There is nothing magical or strange going on with these. You define variables and set their values to any number type.
-
-In this chapter, we'll learn how to create numbers and perform operations on them (like additions and subtractions).
+In this chapter, we'll learn how to create numbers and perform operations on them (like additions and subtractions).