Clarify use of SIA-specific attributes in UseCase_I step 10

[tomdonaldson]

In UseCase_I, step 10, we use .title and .bandpass_id to see attributes of the result rows. This is right after showing the results as a VOTable which does not use those attribute names for its column names. We should explain the SIA API here (SIAResults, SIARecord) and reference the documentation.