message: correct default scopes
diff: @@ -153,11 +153,16 @@ The app private key serves three functions.
  ## Scopes
  -Scopes define the information and permissions an app requests from the user during authentication. If no `scopes` array is provided to the `redirectToSignIn` or `makeAuthRequest` functions, the following is requested:
  +Scopes define the information and permissions an app requests from the
  +user during authentication. Requested scopes may be any of the following:
  +
  - `store_write` - read and write data to the user's Gaia hub in an app-specific storage bucket
  - `publish_data` - publish data so that other users of the app can discover and interact with the user
  - `email` - requests the user's email if available
  + If no `scopes` array is provided to the `redirectToSignIn` or
  +`makeAuthRequest` functions, the default is to request `['store_write']`.
  +
  ## Authentication tokens
  The app and the Blockstack Browser communicate during the authentication flow by passing back and forth two tokens:
  