Augment String.h documentation
Augment String.h documentation

Summary:
TSIA

(Note: this ignores all push blocking failures!)

Reviewed By: praihan

Differential Revision: D38466487

fbshipit-source-id: 15144f78ba8dea8dd4c59418ad68ff6c8b1dcb07

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