Reformat Comments of SimpleAsyncIO to be doxygen compatible
Reformat Comments of SimpleAsyncIO to be doxygen compatible

Summary: Reformat Comments of SimpleAsyncIO to be doxygen compatible.

Reviewed By: Gownta

Differential Revision: D39037166

fbshipit-source-id: bf9eec7482abe8b9276b8a82eb8ed0a7f0f1bb7d

facebook/folly,facebook/folly,facebook/folly,facebook/folly,facebook/folly