removed mentioning of visualization notebook in A2 description

Author: manukastratta

assignments/2023/assignment2.md

@@ -41,7 +41,6 @@ In this assignment you will practice writing backpropagation code, and training
 - Implement **Dropout** to regularize networks.
 - Understand the architecture of **Convolutional Neural Networks** and get practice with training them.
 - Gain experience with a major deep learning framework, **PyTorch**.
-- Explore various applications of image gradients, including saliency maps, fooling images, class visualizations.
 
 ### Q1: Multi-Layer Fully Connected Neural Networks