fixup: sphinx warning

Fixes the sphinx warning:
tools/clang/docs/DiagnosticsReference.rst:7889: WARNING: Title underline
too short.

That I just introduced in r350877.

llvm-svn: 350878
1 file changed
tree: fc63572603943c1f8d63945a722cf72d9cf75da0
  1. clang/
  2. clang-tools-extra/
  3. compiler-rt/
  4. debuginfo-tests/
  5. libclc/
  6. libcxx/
  7. libcxxabi/
  8. libunwind/
  9. lld/
  10. lldb/
  11. llgo/
  12. llvm/
  13. openmp/
  14. parallel-libs/
  15. polly/
  16. pstl/
  17. README.md
README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.