Adding verbiage to the Language Extensions document about __has_include and __has_include_next only being allowed within preprocessor directives.

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availability attribute.


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Language extensions are highly relevant to using clang as a compiler, so
move LanguageExtensions up into `Using Clang as a Compiler` on the
landing page.

The other documents from the now-gone `Language Extensions and Specs`
section on the landing page nicely fit hierarchically under
LanguageExtensions.rst, so put them under LanguageExtensions.rst's
toctree instead of on the landing page.

Impetus from Jordan Rose.

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document


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Updated link in LanguageExtensions.rst to point to BlockLanguageSpec.rst instead of BlockLanguageSpec.txt.

Thanks to Jean-Daniel Dupas for comments!

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heading underline.


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The notes on the objc_method_family and ns_returns_retained-type attributes
have been moved to the Objective-C section, since both are used by ARC.
The notes on analyzer_noreturn are now only on the analyzer site.

The inadequacy of these docs was noticed months ago by Jonathan Sauer;
I'm only just now getting around to cleaning them up.

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Converts:
    LanguageExtensions
    LibASTMatchers
    LibTooling
    PCHInternals
    ThreadSanitizer
    Tooling

Patch by Mykhailo Pustovit!
(with minor edits by Dmitri Gribenko and Sean Silva)

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