Update scope documentation

The scopes seem to have changed on my.usa.gov. The old `profile` scope has been split into more granular `profile.*` scopes. This is based on what I found in the passport-myusa project at: https://github.com/Innovation-Toolkit/passport-myusa/commit/59e458533ff3968f40359ce0a36aca81deee7127
Merge pull request #2 from GUI/patch-1

Update scope documentation