typo fix

"Instance" needed to be pluralized. 

Made the edit in two places (line 478 & 484):

> Finds all _**instance**_ of components

to

> Finds all _**instances**_ of components

![image](https://cloud.githubusercontent.com/assets/2935356/3789268/2f962abe-1a97-11e4-96a7-07bba5529296.png)