Update intro_to_graphs.ipynb

Updated broken link for tf function guide

Author: Saduf2019

site/en/guide/intro_to_graphs.ipynb

@@ -76,7 +76,7 @@
         "\n",
         "Note: For those of you who are only familiar with TensorFlow 1.x, this guide demonstrates a very different view of graphs.\n",
         "\n",
-        "**This is a big-picture overview that covers how `tf.function` allows you to switch from eager execution to graph execution.** For a more complete specification of `tf.function`, go to the [`tf.function` guide](function).\n"
+        "**This is a big-picture overview that covers how `tf.function` allows you to switch from eager execution to graph execution.** For a more complete specification of `tf.function`, go to the [`tf.function` guide](https://www.tensorflow.org/guide/function).\n"
       ]
     },
     {
@@ -843,7 +843,7 @@
       "source": [
         "## Next steps\n",
         "\n",
-        "You can learn more about `tf.function` on the API reference page and by following the [Better performance with `tf.function`](function) guide."
+        "You can learn more about `tf.function` on the API reference page and by following the [Better performance with `tf.function`](https://www.tensorflow.org/guide/function) guide."
       ]
     }
   ],