Cosmetic change for TODO comments in sparsity API

PiperOrigin-RevId: 409353096

Author: abattery

tensorflow_model_optimization/python/core/sparsity/keras/pruning_impl.py

@@ -297,7 +297,7 @@ def update_distributed():
 
   def add_pruning_summaries(self):
     """Adds summaries of weight sparsities and thresholds."""
-    # b/(139939526): update to use public API.
+    # TODO(b/139939526): update to use public API.
     summary = tf.summary
     if not tf.executing_eagerly():
       summary = tf.compat.v1.summary

tensorflow_model_optimization/python/core/sparsity/keras/pruning_wrapper.py

@@ -24,7 +24,7 @@
 import numpy as np
 import tensorflow as tf
 
-# b/(139939526): update to use public API.
+# TODO(b/139939526): update to use public API.
 from tensorflow.python.keras.utils import generic_utils
 from tensorflow_model_optimization.python.core.keras import compat as tf_compat
 from tensorflow_model_optimization.python.core.keras import metrics