Correct a typo in base_layer_utils.

PiperOrigin-RevId: 336753596
Change-Id: I2739ecc8474aa3b37e99039737e640929bcedb66
diff --git a/tensorflow/python/keras/engine/base_layer_utils.py b/tensorflow/python/keras/engine/base_layer_utils.py
index 98414bc..d6b3290 100644
--- a/tensorflow/python/keras/engine/base_layer_utils.py
+++ b/tensorflow/python/keras/engine/base_layer_utils.py
@@ -847,7 +847,7 @@
 
 
 def is_split_variable(v):
-  """Returns True if `v` is either a PartionedVariable or a SharedVariable."""
+  """Returns True if `v` is either a PartionedVariable or a ShardedVariable."""
   return hasattr(v, '_variable_list') or hasattr(v, '_variables')