[PATCH] doc: improve event core description in vDPA mlx5

[Thomas Monjalon]

> > The event core is mlx5 vDPA driver devarg that selects the CPU core for
> > the internal timer thread used to manage data-path events into the
> > driver.
> > 
> > Emphasize that this CPU should be isolated for vDPA mlx5 devices only in
> > order to save the performance and latency of the device.
> > 
> > Signed-off-by: Matan Azrad <matan at nvidia.com>
> 
> Reviewed-by: Chenbo Xia <chenbo.xia at intel.com>

Applied, thanks.