As a user, I want better documentation on the different source formats and data services read by the WRES

[HankHerr-NOAA]

See #138 (comment):

I should note that we're not terribly consistent on this as the declaration language wiki includes extensive documentation on some WRDS services, which was copied across from VLAB. On that basis, we probably could include some better documentation on source formats and data services supported by WRES, indicating where these are not accessible to the general public (because at least they would have a hint that something potentially useful exists). However, as noted above, that probably warrants a different ticket as none of our other formats or supported interface are fully elaborated in that regard, except in the declaration schema, of course.

Thanks,

Hank