message: Fix documentation for trainable SyncOnRead variables.
diff: @@ -378,8 +378,7 @@ class _VariableStore(object):
  aggregated. Accepted values are constants defined in the class
  `tf.VariableSynchronization`. By default the synchronization is set to
  `AUTO` and the current `DistributionStrategy` chooses when to
  - synchronize. If `synchronization` is set to `ON_READ`, `trainable` must
  - not be set to `True`.
  + synchronize.
  aggregation: Indicates how a distributed variable will be aggregated.
  Accepted values are constants defined in the class
  `tf.VariableAggregation`.
  @@ -654,8 +653,7 @@ class _VariableStore(object):
  aggregated. Accepted values are constants defined in the class
  `tf.VariableSynchronization`. By default the synchronization is set to
  `AUTO` and the current `DistributionStrategy` chooses when to
  - synchronize. If `synchronization` is set to `ON_READ`, `trainable` must
  - not be set to `True`.
  + synchronize.
  aggregation: Indicates how a distributed variable will be aggregated.
  Accepted values are constants defined in the class
  `tf.VariableAggregation`.
  