Update MyDense example to use self.add_weight() for proper variable tracking

[vishnoi246]

Fix: Update custom layer example to use self.add_weight()

Problem: The previous MyDense layer created weights with tf.Variable in init. These weights were not automatically registered, so layer.variables and layer.trainable_variables were empty. This breaks standard Keras functionality for training, saving, and inspection.

Solution: Updated MyDense to use self.add_weight(), which properly registers the weights with the layer. Now they appear in .variables and are fully tracked by Keras.

[github-actions[bot]]

Preview

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• site/en/guide/intro_to_modules.ipynb

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Format and style

Use the TensorFlow docs notebook tools to format for consistent source diffs and lint for style:

$ python3 -m pip install -U --user git+https://github.com/tensorflow/docs

$ python3 -m tensorflow_docs.tools.nbfmt notebook.ipynb

$ python3 -m tensorflow_docs.tools.nblint --arg=repo:tensorflow/docs notebook.ipynb

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