Description

in step 3 "Start SNMP" : here: https://docs.mongodb.com/manual/tutorial/monitor-with-snmp/#start-snmp 

instead of "sudo systemctl start mongod" it should be "sudo systemctl start snmpd"
instead of "sudo service mongod start" it should be "sudo service snmpd start"

Scope of changes

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)