[docs] Stop trying to parse the ThinLTO summary IR fragments with the
`llvm` syntax in Sphinx. This appears to just fail and create errors on
the docs buildbot.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@338997 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed