docs: Fix mention of DefmID to MultiClassID.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171940 91177308-0d34-0410-b5e6-96231b3b80d8
TableGen/LangRef: discuss specific C-like escapes

Suggested by Joel Jones.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171941 91177308-0d34-0410-b5e6-96231b3b80d8
TableGen/LangRef: link bang operators into the productionlist

Now BangOperator should be nicely hyperlinked.

Pointed out by Joel Jones.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171942 91177308-0d34-0410-b5e6-96231b3b80d8