GAIASWRQ-25 Rename method to cross_match_basic

Author: Jorge Fernandez Hernandez

astroquery/gaia/core.py

@@ -861,8 +861,10 @@ def cross_match_basic(self, *, table_a_full_qualified_name, table_a_column_ra, t
             #. launches a positional cross-match as an asynchronous query;
             #. returns all the columns from both tables plus the angular distance (deg) for the cross-matched sources.
 
-        The result is a join table with the identifies of both tables and the distance. To speed up the cross-match,
-        pass the biggest table to the ``table_b_full_qualified_name`` parameter.
+        The result is a join table with the identifies of both tables and the distance (degrees), that is returned
+        without metadata units. If desired, units can be added using the Units package of Astropy as follows:
+        results[‘separation’].unit = u.degree. To speed up the cross-match, pass the biggest table to the
+        ``table_b_full_qualified_name`` parameter.
         TAP+ only
 
         Parameters