Replace commented-out use of nonexistent FOLLY_DEPRECATED
Replace commented-out use of nonexistent FOLLY_DEPRECATED

Summary: [Yarpl] Replace commented-out use of nonexistent `FOLLY_DEPRECATED`.

Reviewed By: phoad

Differential Revision: D16569623

fbshipit-source-id: 42d7acb272c039c62b9929e3124e40203534ab11

rsocket/rsocket-cpp,rsocket/rsocket-cpp,rsocket/rsocket-cpp,rsocket/rsocket-cpp,ReactiveSocket/reactivesocket-cpp,ReactiveSocket/reactivesocket-cpp,ReactiveSocket/reactivesocket-cpp