Fix typos in tacotron2 tutorial (#2761)

Summary:
`publishe`->`published`

Also, not sure if it should be `pre-trained weight is published` or `pre-trained weights are published`

Pull Request resolved: https://github.com/pytorch/audio/pull/2761

Reviewed By: carolineechen

Differential Revision: D40313042

Pulled By: malfet

fbshipit-source-id: c22085ca0b1125a06aa04bf38231d0a9fbfed00b

examples/tutorials/tacotron2_pipeline_tutorial.py

@@ -311,8 +311,8 @@ IPython.display.Audio(waveforms[0:1].cpu(), rate=vocoder.sample_rate)
 # Waveglow
 # ~~~~~~~~
 #
-# Waveglow is a vocoder published by Nvidia. The pretrained weight is
-# publishe on Torch Hub. One can instantiate the model using ``torch.hub``
+# Waveglow is a vocoder published by Nvidia. The pretrained weights are
+# published on Torch Hub. One can instantiate the model using ``torch.hub``
 # module.
 #