Fixing a typo in the available keys, forgetting the comma. Also, shortening the documentation requirements on valid keys

[TheDarkTrumpet]

This pull request deals with two things:

1. 'breakoutSets' within the get_survey_responses method didn't have a comma. This caused it to blend with the line below, and it was being raised.
2. The documentation between the allowed arguments and the response from the raise statement was inconsistent. Instead of typing each argument manually, I joined the available options together. This will keep the raise consistent without the need to update in two spots.