[PATCH] Re-factor TableGen docs

[Renato Golin]

  Removing TableGen from root's toctree, since they're in the TableGen/index toctree.

Hi silvas, aaron.ballman,

http://llvm-reviews.chandlerc.com/D3120

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D3120?vs=7952&id=7953#toc

Files:
  docs/TableGen/BackEnds.rst
  docs/TableGen/Deficiencies.rst
  docs/TableGen/LangRef.rst
  docs/TableGen/index.rst
  docs/index.rst
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