Put the full help before the options
Put the full help before the options

Summary: This is more in line with "traditional" output from cli tools on *nix.

Reviewed By: yfeldblum

Differential Revision: D4719055

fbshipit-source-id: 2389a4a2a49f18d4b3d0257f68036f73f8fbc49e

Orvid/folly,facebook/folly,rklabs/folly,rklabs/folly,Orvid/folly,rklabs/folly,facebook/folly,Orvid/folly,rklabs/folly,facebook/folly,Orvid/folly,facebook/folly,rklabs/folly,Orvid/folly,facebook/folly