Wiki: add information about the blocking PVST BPDUs

RouterOS General
1

please add information about the blocking PVST BPDUs in https://help.mikrotik.com/docs/display/ROS/Bridge#Bridge-DropsentBPDUs

/interface ethernet switch rule
add dst-mac-address=01:00:0C:CC:CC:CD/FF:FF:FF:FF:FF:FF new-dst-ports="" ports=ether1 switch=switch1

https://techhub.hpe.com/eginfolib/networking/docs/switches/5950/5200-2216a_l2-lan_cg/content/472583554.htm

PVST BPDU uses the same format as an RSTP BPDU except the following differences:
The destination MAC address of a PVST BPDU is 01-00-0c-cc-cc-cd, which is a private MAC address.