remove DecodeError

Author: roboteng

platform/Env.roc

@@ -65,16 +65,16 @@ var = \name ->
 ##
 ## ```
 ## # Reads "NUM_THINGS" and decodes into a U16
-## getU16Var : Str -> Task U16 [VarNotFound, DecodeErr DecodeError] [Read [Env]]
+## getU16Var : Str -> Task U16 [VarNotFound, DecodeErr [TooShort]] [Read [Env]]
 ## getU16Var = \var -> Env.decode var
 ## ```
 ##
 ## If `NUM_THINGS=123` then `getU16Var` succeeds with the value of `123u16`.
 ## However if `NUM_THINGS=123456789`, then `getU16Var` will
-## fail with [DecodeErr](https://www.roc-lang.org/builtins/Decode#DecodeError)
+## fail with [TooShort]
 ## because `123456789` is too large to fit in a [U16](https://www.roc-lang.org/builtins/Num#U16).
 ##
-decode : Str -> Task val [VarNotFound, DecodeErr DecodeError] where val implements Decoding
+decode : Str -> Task val [VarNotFound, DecodeErr [TooShort]] where val implements Decoding
 decode = \name ->
     Effect.envVar name
     |> Effect.map