Fixed broken link in TF Lite codelab header

PiperOrigin-RevId: 272613742

Author: khanhlvg

lite/codelabs/digit_classifier/ml/step2_train_ml_model.ipynb

@@ -79,12 +79,12 @@
       "source": [
         "<table class=\"tfo-notebook-buttons\" align=\"left\">\n",
         "  <td>\n",
-        "    <a target=\"_blank\" href=\"https://colab.research.google.com/github/tensorflow/examples/blob/master/lite/codelab/digit_classifier/ml/step2_train_ml_model.ipynb\">\n",
+        "    <a target=\"_blank\" href=\"https://colab.research.google.com/github/tensorflow/examples/blob/master/lite/codelabs/digit_classifier/ml/step2_train_ml_model.ipynb\">\n",
         "    <img src=\"https://www.tensorflow.org/images/colab_logo_32px.png\" />\n",
         "    Run in Google Colab</a>\n",
         "  </td>\n",
         "  <td>\n",
-        "    <a target=\"_blank\" href=\"https://github.com/tensorflow/examples/blob/master/lite/codelab/digit_classifier/ml/step2_train_ml_model.ipynb\">\n",
+        "    <a target=\"_blank\" href=\"https://github.com/tensorflow/examples/blob/master/lite/codelabs/digit_classifier/ml/step2_train_ml_model.ipynb\">\n",
         "    <img src=\"https://www.tensorflow.org/images/GitHub-Mark-32px.png\" />\n",
         "    View source on GitHub</a>\n",
         "  </td>\n",