Record the shared launch-year parser in the state doc and fragment

changelog.d/1453-satellite-launch-year.md

@@ -1,3 +1,6 @@
-- Space Missions no longer shows an older satellite with a similar name as a
-  new payload's orbit: the launch-year check on loaded satellites now runs
-  (Aditya, @Rohilalala, #1453).
+- Space Missions no longer shows an older satellite with a similar name and a
+  different known launch year as a new payload's orbit: the launch-year check
+  on loaded satellites now runs (Aditya, @Rohilalala, #1453).
+- Satellite launch years come from one TLE designator parser for both the
+  loaded catalog and the active-TLE fallback; a blank designator is an
+  unknown year instead of 2000 (#1453).