message: Update keras_support.py
diff: @@ -201,7 +201,7 @@ class TPUDistributionStrategy(object):
  removed in future once the model replication functionality is mature
  enough. If `False` (default behavior), the system automatically finds
  the best configuration, in terms of number of TPU cores, for the model
  - replication, typically using all avaiable TPU cores. If overwrites as
  + replication, typically using all available TPU cores. If overwrites as
  `True`, force the model replication using single core, i.e., no
  replication.
  Raises:
  