[PATCH] Update clang-tidy documentation.

[Alexander Kornienko]

Added information about -checks='*' to -list-checks help message. Reformatted
option descriptions, so that they fit into 80 columns on the terminal.

http://reviews.llvm.org/D3793

Files:
  clang-tidy/tool/ClangTidyMain.cpp
  docs/clang-tidy.rst
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