Docs: send-email: Create logical groupings for --help text
Docs: send-email: Create logical groupings for --help text

The options are partitioned into more digestible groups.

Signed-off-by: Michael Witten <d27909578f951e4c68b030a5251d5e11d9ec440e@mit.edu>
Acked-by: Jeff King <696e3fbcf235d40b6ea1ebd61c87cbea79d444e7@peff.net>
Signed-off-by: Shawn O. Pearce <f01032651c12a22b2103346ba96b3b6b231f9d3c@spearce.org>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git