Added documentation on how clang diagnostics are reported by clang-tidy.


git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@213147 91177308-0d34-0410-b5e6-96231b3b80d8
Avoid adding redundant parens.

Reviewers: bkramer

Reviewed By: bkramer

Subscribers: cfe-commits, sbenza

Differential Revision: http://reviews.llvm.org/D4534

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@213149 91177308-0d34-0410-b5e6-96231b3b80d8