Remove unused diagnostics.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190500 91177308-0d34-0410-b5e6-96231b3b80d8
SemaTemplateDeduction.cpp: Prune two stray \param(s), TPOC and NumCallArguments in Sema::getMostSpecialized(). They were removed since r190444. [-Wdocumentation]

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@190501 91177308-0d34-0410-b5e6-96231b3b80d8