Minor docstring cleanup

Author: bsipocz

astroquery/ipac/irsa/core.py

@@ -91,7 +91,7 @@ def query_sia(self, *, pos=None, band=None, time=None, pol=None,
         Returns
         -------
         Results in `pyvo.dal.SIAResults` format.
-        result.table in Astropy table format
+        result.to_table() in Astropy table format
         """
         return self.sia.search(
             pos=pos,