Update server/polar/models/subscription.py

Author: pieterbeulque

server/polar/models/subscription.py

@@ -218,10 +218,6 @@ def product(cls) -> Mapped["Product"]:
     )
     """
     Timestamp when the discount was first applied to a billing cycle.
-
-    This is used to determine when repeating discounts should expire.
-    It remains null until the discount is actually used in a billing cycle,
-    at which point it's set to that cycle's start date.
     """
 
     @declared_attr