typo

Author: havenwang

documentation/api.md

@@ -300,7 +300,7 @@ The utility library provides general functionality, which makes it easy to retri
   <br/>
 
 * {boolean} **Breinify.UTL.isSimpleObject(obj)**:<br/>
-  Checks if the passed object is a simpe object, i.e., is *null* or is an object without any function and just using simple types (e.g., *boolean*, *string*, *number*, *null*) or an array of simple types (of the same type).
+  Checks if the passed object is a simple object, i.e., is *null* or is an object without any function and just using simple types (e.g., *boolean*, *string*, *number*, *null*) or an array of simple types (of the same type).
 
   **Example of a simple object**:
   ```javascript