[PATCH] doc: remove references to obsolete testpmd flag

[Bruce Richardson]

On Tue, Mar 10, 2026 at 10:49:45AM +0000, Ciara Loftus wrote:
> The packet-filter-mode flag was removed in a previous commit. Remove
> references to it in the documentation.
> 
> Fixes: 5007ac13189d ("ethdev: remove deprecated Flow Director configuration")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Ciara Loftus <ciara.loftus at intel.com>
> ---
Acked-by: Bruce Richardson <bruce.richardson at intel.com>