update minor punctuation errors

Author: Jihun Han

site/en/tutorials/images/segmentation.ipynb

@@ -710,7 +710,7 @@
         "id": "Gbwo3DZ-9TxM"
       },
       "source": [
-        "So, to make sample weights for this tutorial, you need a function that takes a `(data, label)` pair and returns a `(data, label, sample_weight)` triple. Where the `sample_weight` is a 1-channel image containing the class weight for each pixel.\n",
+        "So, to make sample weights for this tutorial, you need a function that takes a `(data, label)` pair and returns a `(data, label, sample_weight)` triple where the `sample_weight` is a 1-channel image containing the class weight for each pixel.\n",
         "\n",
         "The simplest possible implementation is to use the label as an index into a `class_weight` list:"
       ]
@@ -804,7 +804,7 @@
         "\n",
         "Now that you have an understanding of what image segmentation is and how it works, you can try this tutorial out with different intermediate layer outputs, or even different pretrained models. You may also challenge yourself by trying out the [Carvana](https://www.kaggle.com/c/carvana-image-masking-challenge/overview) image masking challenge hosted on Kaggle.\n",
         "\n",
-        "You may also want to see the [Tensorflow Object Detection API](https://github.com/tensorflow/models/blob/master/research/object_detection/README.md) for another model you can retrain on your own data. Pretrained models are available on [TensorFlow Hub](https://www.tensorflow.org/hub/tutorials/tf2_object_detection#optional)"
+        "You may also want to see the [Tensorflow Object Detection API](https://github.com/tensorflow/models/blob/master/research/object_detection/README.md) for another model you can retrain on your own data. Pretrained models are available on [TensorFlow Hub](https://www.tensorflow.org/hub/tutorials/tf2_object_detection#optional)."
       ]
     }
   ],