Removing a few more :option: tags that we do not have corresponding .. option directives for; these are causing the sphinx bot to fail (http://lab.llvm.org:8011/builders/clang-sphinx-docs/builds/15197/steps/docs-clang-html/logs/stdio).

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@275430 91177308-0d34-0410-b5e6-96231b3b80d8