change [[nodiscard]] to FOLLY_NODISCARD for "xplat/quic/logging/QLoggerTypes.h"
change [[nodiscard]] to FOLLY_NODISCARD for "xplat/quic/logging/QLoggerTypes.h"

Summary: Not all compilers are happy about `[[nodiscard]]`. Use `FOLLY_NODISCARD` instead.

Reviewed By: mzlee

Differential Revision: D23674697

fbshipit-source-id: db72cb45c2231a7a3734dafceac026880d49bb86

facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst,facebookincubator/mvfst