message: Fix typo in tf.Module docstrings.
diff: @@ -141,7 +141,7 @@ class Module(tracking.AutoTrackable):
  @property
  def variables(self):
  - """Sequence of variables owned by this module and it's submodules.
  + """Sequence of variables owned by this module and its submodules.
  Note: this method uses reflection to find variables on the current instance
  and submodules. For performance reasons you may wish to cache the result
  @@ -156,7 +156,7 @@ class Module(tracking.AutoTrackable):
  @property
  def trainable_variables(self):
  - """Sequence of variables owned by this module and it's submodules.
  + """Sequence of trainable variables owned by this module and its submodules.
  Note: this method uses reflection to find variables on the current instance
  and submodules. For performance reasons you may wish to cache the result
  