Fix a broken link in pytorch_with_examples.rst (#3238)

Fix link in pytorch-with-examples

Co-authored-by: Svetlana Karslioglu <svekars@meta.com>

Author: sekyondaMeta

beginner_source/pytorch_with_examples.rst

@@ -149,7 +149,7 @@ which will be optimized during learning.
 
 In TensorFlow, packages like
 `Keras <https://github.com/fchollet/keras>`__,
-`TensorFlow-Slim <https://github.com/tensorflow/tensorflow/tree/master/tensorflow/contrib/slim>`__,
+`TensorFlow-Slim <https://github.com/google-research/tf-slim>`__,
 and `TFLearn <http://tflearn.org/>`__ provide higher-level abstractions
 over raw computational graphs that are useful for building neural
 networks.