Fix MyDense example input to use tf.Variable instead of list

This PR fixes a small issue in the MyDense layer example in intro_to_modules.ipynb.
The original code used a plain Python list as input:
simple_layer([[2.0, 2.0, 2.0]])

This caused an error because tf.matmul expects a TensorFlow tensor or variable, not a list.

Updated the code to:
simple_layer(tf.Variable([[2.0, 2.0, 2.0]]))

This change ensures the example runs correctly and aligns with TensorFlow’s expected input types.

Author: vishnoi246

site/en/guide/intro_to_modules.ipynb

@@ -775,7 +775,7 @@
       },
       "outputs": [],
       "source": [
-        "simple_layer([[2.0, 2.0, 2.0]])"
+        "simple_layer(tf.Variable([[2.0, 2.0, 2.0]]))"
       ]
     },
     {