Update tf.function guide link in saved_model.ipynb

Author: 8bitmp3

site/en/guide/saved_model.ipynb

@@ -406,7 +406,7 @@
         "\n",
         "Briefly, `tf.function` works by tracing the Python code to generate a ConcreteFunction (a callable wrapper around `tf.Graph`). When saving a `tf.function`, you're really saving the `tf.function`'s cache of ConcreteFunctions.\n",
         "\n",
-        "To learn more about the relationship between `tf.function` and ConcreteFunctions, see the [tf.function guide](https://www.tensorflow.org//guide/function)."
+        "To learn more about the relationship between `tf.function` and ConcreteFunctions, refer to the [tf.function guide](function.ipynb)."
       ]
     },
     {