Update the coordinates notebook to address the vizier/gaia row_limits

The gist of this problem is that the "row limit" feature will cause people who haven't configured their systems to ignore the row limit will only get 50 entries in the vizier/gaia tables.

We should probably just add `Gaia.ROW_LIMIT = -1` and similar for vizier or something like that.

Open the coordinates notebook and inspect the cells that query the vizier/gaia tables, starting with how their row limits are configured. Confirm the intended configuration and verify that the queries return more than 50 entries without requiring users to configure their systems.

Written by the indexing model from the issue text.