Update MPC star catalog docstring

Author: tristandijkstra

CHANGES.rst

@@ -8,6 +8,11 @@ New Tools and Services
 Service fixes and enhancements
 ------------------------------
 
+mpc
+^^^
+
+- Parse star catalog information when querying observations database [#2957]
+
 
 Infrastructure, Utility and Other Changes and Additions
 -------------------------------------------------------
@@ -1202,7 +1207,6 @@ mpc
 ^^^
 
 - Functionality added to query observations database. [#1350]
-- Parse star catalog information when querying observations database [#2957]
 
 
 Service fixes and enhancements

astroquery/mpc/core.py

@@ -876,11 +876,12 @@ def get_observations_async(self, targetid, *,
         (*): Column names are optional and
         depend on whether an asteroid or a comet has been queried.
 
-        (#): Parameters ``Note1`` and ``Note2`` are defined here:
-        https://minorplanetcenter.net/iau/info/OpticalObs.html.
+        (#): Parameters ``Note1`` and ``Note2`` are defined in the
+        `MPC 80-column format description
+        <https://minorplanetcenter.net/iau/info/OpticalObs.html>`_
 
-        (!): Definitions of star catalog codes can be found here:
-        https://www.minorplanetcenter.net/iau/info/CatalogueCodes.html.
+        (!): `Description of star catalog codes
+        <https://minorplanetcenter.net/iau/info/OpticalObs.html>`_
 
 
         Examples