[RESEND RFC 05/18] drm/display/dp_mst: Fix confusing docs for drm_dp_atomic_release_time_slots()

For some reason we mention returning 0 if "slots have been added back to drm_dp_mst_topology_state->avail_slots". This is totally misleading, avail_slots is simply for figuring out the total number of slots available in total on the topology and has no relation to the current payload allocations.

[RFC 05/18] drm/display/dp_mst: Fix confusing docs for drm_dp_atomic_release_time_slots()

For some reason we mention returning 0 if "slots have been added back to drm_dp_mst_topology_state->avail_slots". This is totally misleading, avail_slots is simply for figuring out the total number of slots available in total on the topology and has no relation to the current payload allocations.