[clang-tidy] adjust cppcoreguidelines-owning-memory documentation

Summary:
A user of the check opened a bugreport and reported that `std::exchange`
triggers a false positive. I adjusted the doc to include a list of known
(std) constructs that do trigger the issue with templates forgetting the
type alias.

Reviewers: aaron.ballman, alexfh, hokein

Reviewed By: aaron.ballman

Subscribers: klimek, nemanjai, xazax.hun, kbarton, cfe-commits

Differential Revision: https://reviews.llvm.org/D40829

llvm-svn: 319785