Update README.md

Author: internet5

README.md

@@ -52,15 +52,14 @@ In a browser:
 ```
 ## API
 ### `smartArrayToTree(data, [options])`
-Convert a plain array of nodes (with pointers to parent nodes) to a a nested data structure.
 
 #### Parameters
 - **Array** `data`: An array of data
 - **Object** `options`: An object containing the following fields:
   - `id` (String): An unique node identifier. Default: 'id'
   - `pid` (String): A name of a property where a link to a parent node could be found. Default: 'pid'
   - `children` (String): The child node name that you want. Default: 'children'
-  - `firstPid` (String): The parent id of fisrt level node . Default: null
+  - `firstPid` (String): The parent id of top level node . Default: null
 
 #### Return
 - **Array**: Result of transformation