Regenerate DiagnosticsReference.rst

$ bin/clang-tblgen -gen-diag-docs -I../cfe.src/include/clang/Basic \
    ../cfe.src/include/clang/Basic/Diagnostic.td \
    -o ../cfe.src/docs/DiagnosticsReference.rst



git-svn-id: https://llvm.org/svn/llvm-project/cfe/branches/release_60@325889 91177308-0d34-0410-b5e6-96231b3b80d8

Author: zmodem