This patch adds information to testpmd_funcs.rst file,
about limited number of vlan_ids possible to be enabled
in a filter. This is limited to the maximum number of entries
possible in the VFTA table.
Signed-off-by: Michal Jastrzebski <michalx.k.jastrzebski@intel.com>
Acked-by: Pablo de Lara <pablo.de.lara.guarch@intel.com>