Update hh_shared naming convention
Update hh_shared naming convention

Summary: Instead of size_b, use bsize, document wsize

Reviewed By: mroch

Differential Revision: D25034565

fbshipit-source-id: 433aa578323a6aca84ff7a0b5d44d80a7c5fab02

nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow