Add the tap and sbr plugins in doc

Signed-off-by: astraw99 <wangchengiscool@gmail.com>

Author: astraw99

plugins/linux_only.txt

@@ -5,10 +5,12 @@ plugins/main/ipvlan
 plugins/main/loopback
 plugins/main/macvlan
 plugins/main/ptp
+plugins/main/tap
 plugins/main/vlan
 plugins/main/dummy
 plugins/meta/portmap
 plugins/meta/tuning
 plugins/meta/bandwidth
 plugins/meta/firewall
 plugins/meta/vrf
+plugins/meta/sbr