update docs

Author: dkuku

lib/ecto/schema.ex

@@ -1596,7 +1596,7 @@ defmodule Ecto.Schema do
       section for more info). Primary keys are automatically set up for embedded
       schemas as well, defaulting to `{:id,  :binary_id, autogenerate: true}`.
       This will generate the default UUID v4. You can use UUID v7 instead by setting
-      the primary key to `{:id, :binary_id, autogenerate: {Ecto.UUID, :generate, [:v7]}}`
+      the primary key to `{:id, :binary_id, autogenerate: [version: 7]}`
       Note `:primary_key`s are not automatically read back on `insert/2`,
       unless one of `autogenerate: true` or `read_after_writes: true` is set.
 

lib/ecto/uuid.ex

@@ -14,7 +14,7 @@ defmodule Ecto.UUID do
   To use UUID v7 (time-ordered) instead:
 
       use Ecto.Schema
-      @primary_key {:id, :binary_id, autogenerate: {Ecto.UUID, :generate, [:v7]}}
+      @primary_key {:id, :binary_id, autogenerate: [version: 7]}
   """
 
   use Ecto.Type