raise ArgumentError for invalid Enum.count_until

As a follow up to elixir-lang#15027, provide a nicer error message when invoking
`Enum.count_until` with an invalid limit

Author: davydog187

lib/elixir/lib/enum.ex

@@ -780,6 +780,10 @@ defmodule Enum do
     end
   end
 
+  def count_until(_enumerable, _limit) do
+    raise ArgumentError, "Enum.count_until/2 only accepts limits greater than 0"
+  end
+
   @doc """
   Counts the elements in the enumerable for which `fun` returns a truthy value, stopping at `limit`.
 
@@ -801,6 +805,10 @@ defmodule Enum do
     end
   end
 
+  def count_until(_enumerable, _fun, _limit) do
+    raise ArgumentError, "Enum.count_until/3 only accepts limits greater than 0"
+  end
+
   @doc """
   Enumerates the `enumerable`, returning a list where all consecutive
   duplicate elements are collapsed to a single element.