Reword for clarity

After reading the original version, I am led to expect `.value` to be string type - it is `number`.
Also, because the words `integer` and `string` are styled as <code>, it suggests `integer` is also a JS type, which is not the case.

docs/01-usage.md

@@ -58,7 +58,7 @@ By default, currency resolves to a `string` value.
 document.getElementsByTagName("input")[0].value = currency(1234.56).add(6.44); // 1241.00
 ```
 
-If you need access to the raw numbers, the value is stored as both an `integer` and a `string`, which you can access with `.intValue` or `.value`;
+If you need access to the value's digits, you can access them with `.value` or `.intValue` (stored without a decimal seperator). Both are `number` type.
 
 ```js
 // Get the internal values