message: Correct out-of-date docstring for StaticHashTable
diff: @@ -239,16 +239,34 @@ class InitializableLookupTableBaseV1(InitializableLookupTableBase):
  @tf_export("lookup.StaticHashTable", v1=[])
  class StaticHashTable(InitializableLookupTableBase):
  - """A generic hash table implementation.
  + """A generic hash table implementation. The table is immutable once
  + initialized.
  Example usage:
  ```python
  + keys_tensor = tf.constant([1, 2])
  + vals_tensor = tf.constant([3, 4])
  + input_tensor = tf.constant([1, 5])
  table = tf.lookup.StaticHashTable(
  - tf.KeyValueTensorInitializer(keys, values), -1)
  + tf.lookup.KeyValueTensorInitializer(keys_tensor, vals_tensor), -1)
  + print(table.lookup(input_tensor))
  + ```
  +
  + When running in graph mode, you must evaluate the tensor returned by
  + `tf.tables_initializer()` before evaluating the tensor returned by
  + this class's `lookup()` method. Example usage in graph mode:
  +
  + ```python
  + keys_tensor = tf.constant([1, 2])
  + vals_tensor = tf.constant([3, 4])
  + input_tensor = tf.constant([1, 5])
  + table = tf.lookup.StaticHashTable(
  + tf.lookup.KeyValueTensorInitializer(keys_tensor, vals_tensor), -1)
  out = table.lookup(input_tensor)
  - table.init.run()
  - print(out.eval())
  + with tf.Session() as sess:
  + sess.run(tf.tables_initializer())
  + print(sess.run(out))
  ```
  """
  