Remove reference to return from Comonad doc

Author: garyb

src/Control/Comonad.purs

@@ -11,8 +11,7 @@ import Data.Functor (class Functor, map, void, ($>), (<#>), (<$), (<$>))
 -- | `Comonad` extends the `Extend` class with the `extract` function
 -- | which extracts a value, discarding the comonadic context.
 -- |
--- | `Comonad` is the dual of `Monad`, and `extract` is the dual of
--- | `pure` or `return`.
+-- | `Comonad` is the dual of `Monad`, and `extract` is the dual of `pure`.
 -- |
 -- | Laws:
 -- |