Update data collector docs (#670)
Update data collector docs (#670)

* Update data collector docs

* Update src/index.js

Co-authored-by: Holly Stotelmyer <672106179ed713ba6f3456a228827a4bab064640@me.com>

Co-authored-by: Holly Stotelmyer <672106179ed713ba6f3456a228827a4bab064640@me.com>
braintree/braintree-web-drop-in,braintree/braintree-web-drop-in,braintree/braintree-web-drop-in