fix(comment): Fix error in comment.

tensorflow_recommenders_addons/dynamic_embedding/python/keras/layers/embedding.py

@@ -311,17 +311,23 @@ class FieldWiseEmbedding(BasicEmbedding):
   ```python
   nslots = 3
   @tf.function
-  def map_slot_fn(feature_id):
+  def feature_to_slot(feature_id):
     field_id = tf.math.mod(feature_id, nslots)
     return field_id
 
   ids = tf.constant([[23, 12, 0], [9, 13, 10]], dtype=tf.int64)
-  embedding = de.layers.FieldWiseEmbedding(1, nslots, map_slot_fn)
+  embedding = de.layers.FieldWiseEmbedding(2,
+                                           nslots,
+                                           slot_map_fn=feature_to_slot,
+                                           initializer=tf.keras.initializer.Zeros())
+
+  out = embedding(ids)
+  # [[[0., 0.], [0., 0.], [0., 1.]]
+  #  [[0., 0.], [0., 0.], [0., 1.]]]
 
   prepared_keys = tf.range(0, 100, dtype=tf.int64)
   prepared_values = tf.ones((100, 2), dtype=tf.float32)
   embedding.params.upsert(prepared_keys, prepared_values)
-
   out = embedding(ids)
   # [[2., 2.], [0., 0.], [1., 1.]]
   # [[1., 1.], [2., 2.], [0., 0.]]