Fix Join.escape/3 and quoted_type specs (#4804)

Author: lukaszsamson

lib/ecto/query/builder.ex

@@ -52,7 +52,11 @@ defmodule Ecto.Query.Builder do
   which include all primitive types and custom user types. Also
   note custom user types do not show up during compilation time.
   """
-  @type quoted_type :: Ecto.Type.primitive() | {non_neg_integer, atom | Macro.t()}
+  @type quoted_type ::
+          Ecto.Type.primitive()
+          | :atom
+          | {:tuple, [quoted_type]}
+          | {non_neg_integer, atom | Macro.t()}
 
   @typedoc """
   The accumulator during escape.

lib/ecto/query/builder/join.ex

@@ -43,7 +43,7 @@ defmodule Ecto.Query.Builder.Join do
 
   """
   @spec escape(Macro.t(), Keyword.t(), Macro.Env.t()) ::
-          {atom, Macro.t() | nil, Macro.t() | nil, list}
+          {atom, Macro.t() | nil, Macro.t() | nil, Macro.t() | nil, list}
   def escape({:in, _, [{var, _, context}, expr]}, vars, env)
       when is_atom(var) and is_atom(context) do
     {_, expr, assoc, prelude, params} = escape(expr, vars, env)