Altered description of input(name) selector

Altered the description of the input selector in order to make it's use clearer. The original description made it seem that you were selecting an input element based upon it's name attribute. In reality, you are selecting an element by the ng-model name.

This became apparent when running new E2E tests. E2E spec file and a print out from my E2E tests available below. 

E2E spec 
```javascript
input('merchant').enter('bob');
```

Error message printout from console. 
```
 input 'merchant' enter 'bob'
        Selector [ng\:model="merchant"] did not match any elements.
```