Docs: tweak features.md

docs/source/features.md

@@ -299,7 +299,7 @@ five = (id :: Natural -> Natural) 5
 (0-Quantity)=
 ## 0-Quantity Parameters
 
-Parameters can be annotated with a _quantity_ of either `0` or `ω` (the default quantity is `ω` if no quantity is explicitly annotated). Such parameters are irrelevant to evaluation, so they are irrelevant to the compiled Haskell program, and so agda2hs erases them.
+Parameters can be annotated with a _quantity_ of either `0` or `ω` (the default quantity is `ω` if no quantity is explicitly annotated). Parameters annotated with `0` are irrelevant to evaluation, so they are irrelevant to the compiled Haskell program, and so agda2hs erases them.
 
 Agda:
 ```agda