Explain the magic numbers for Bounded Int. (#172)

* Explain the magic numbers for Bounder Int.

* Remove docs, move to PS in next commit.

* Add docs for Bounded Int values

* Formatting

src/Data/Bounded.purs

@@ -22,6 +22,9 @@ instance boundedBoolean :: Bounded Boolean where
   top = true
   bottom = false
 
+-- | The `Bounded` `Int` instance has `top :: Int` equal to 2^31 - 1,
+-- | and `bottom :: Int` equal to -2^31, since these are the largest and smallest
+-- | integers representable by twos-complement 32-bit integers, respectively.
 instance boundedInt :: Bounded Int where
   top = topInt
   bottom = bottomInt