Update GettingStarted.md (#2695)
Update GettingStarted.md (#2695)

There are two different 'things' named `handleSubmit` in this example.
One is custom handler defined on `ContactPage` component, and other one is name of property injected by `reduxForm` hoc.
This may cause confusion, especially due to structure of this example:
`<ContactForm onSubmit={this.handleSubmit} />` is only slightly different then `<ContactForm handleSubmit={this.handleSubmit} />`.
My proposal is to change name of custom handler method from `handleSubmit` to `submit`.
erikras/redux-form,erikras/redux-form