[clang-doc] Switch Generator::CreateResources to use llvm::Error

Differential Revision: https://reviews.llvm.org/D66502

git-svn-id: https://llvm.org/svn/llvm-project/clang-tools-extra/trunk@369925 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed