More comments in stdlib (#237)

priv/stdlib/Pair.aes

@@ -6,12 +6,18 @@ namespace Pair =
   function snd(t : ('a * 'b)) : 'b = switch(t)
     (_, y) => y
 
+/** Map over first
+ */
   function map1(f : 'a => 'c, t : ('a * 'b)) : ('c * 'b) = switch(t)
     (x, y) => (f(x), y)
 
+/** Map over second
+ */
   function map2(f : 'b => 'c, t : ('a * 'b)) : ('a * 'c) = switch(t)
     (x, y) => (x, f(y))
 
+/** Map over both
+ */
   function bimap(f : 'a => 'c, g : 'b => 'd, t : ('a * 'b)) : ('c * 'd) = switch(t)
     (x, y) => (f(x), g(y))