[clang-tidy] Fix documentation of misc-suspicious-missing-comma

Summary:
The clang-tidy documentation generation was broken since commit : http://reviews.llvm.org/D18457

I ran locally the documentation generation and I fixed errors related to that specific check.

Reviewers: alexfh

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D18764

llvm-svn: 265375