Pr v130 doc changes oct10 take2 (#27721)
Summary:
resolves issues:
https://github.com/pytorch/pytorch/issues/27703
Updates to index for v1.3.0
* add javasphinx to the required sphinx plugins
* Update "Package Reference" to "Python API"
* Add in torchaudio and torchtext reference links so they show up across all docs not just the main page
* Add "Other Languages" section, add in C++ docs, add in Javadocs
* Add link to XLA docs under Notes: http://pytorch.org/xla/
this includes changes to:
docs/source/conf.py
docs/source/index.rst
docs/source/nn.rst
docs/requirements.txt
Pull Request resolved: https://github.com/pytorch/pytorch/pull/27721
Differential Revision: D17881973
Pulled By: jlin27
fbshipit-source-id: ccc1e9e4da17837ad99d25df997772613f76aea8
