[PATCH] doc: announce marking bus object as internal

[Bruce Richardson]

On Thu, Jun 30, 2022 at 11:41:53AM +0200, David Marchand wrote:
> rte_bus is unnecessarily exposed in the public API/ABI.
> Besides, we had cases where extending rte_bus was necessary.
> Announce that rte_bus will be made opaque in the public API and mark
> associated API as internal.
> 
> Signed-off-by: David Marchand <david.marchand at redhat.com>
> ---
> A RFC series of the intended changes is available at:
> https://patches.dpdk.org/project/dpdk/list/?series=23811&state=%2A&archive=both
> 
> ---
Acked-by: Bruce Richardson <bruce.richardson at intel.com>