mesh: Provide documentation for the publication API
mesh: Provide documentation for the publication API

Document all members of the bt_mesh_model_pub struct.

X-Original-Commit: daa71e85231427544b0be74a62ee682b0f4e92b2

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble