fix error in documentation

Author: yuqiww

baus/variables.py

@@ -961,7 +961,7 @@ def effective_max_dua(zoning_existing, parcels):
 
     s = pd.concat([s, strategy_max_dua], axis=1).max(axis=1)
 
-    # take the min dua IFF the upzone value is less than the current value
+    # take the min dua IFF the downzone value is less than the current value
     # i.e. don't let the downzoning operation accidentally upzone
 
     strategy_min_dua = orca.get_table("zoning_strategy").dua_down