fix url (#1243)

tutorials/notebooks/mct_features_notebooks/keras/example_keras_post-training_quantization.ipynb

@@ -4,7 +4,7 @@
    "cell_type": "markdown",
    "source": [
     "# Post-Training Quantization in Keras using the Model Compression Toolkit (MCT)\n",
-    "[Run this tutorial in Google Colab](https://colab.research.google.com/github/sony/model_optimization/blob/main/tutorials/notebooks/mct_features_notebooks/keras/example_keras_post_training_quantization.ipynb)\n",
+    "[Run this tutorial in Google Colab](https://colab.research.google.com/github/sony/model_optimization/blob/main/tutorials/notebooks/mct_features_notebooks/keras/example_keras_post-training_quantization.ipynb)\n",
     "\n",
     "## Overview\n",
     "This quick-start guide explains how to use the **Model Compression Toolkit (MCT)** to quantize a Keras model. We will load a pre-trained model and  quantize it using the MCT with **Post-Training Quatntization (PTQ)**. Finally, we will evaluate the quantized model and export it to a Keras or TFLite files.\n",