[PATCH] Re-factor TableGen docs

[Renato Golin]

  Changing to C++ comment style, re-wording the DSL part and making it clear on the Deficiencies that the area is for known problems, to help people work around issues that are likely not going to be "resolved" because it's just the behaviour of the language/tool.

Hi silvas, aaron.ballman,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D3120?vs=7953&id=7956#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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