Update MIB instruction for SNMP (#1618)
Update MIB instruction for SNMP (#1618)

the method for converting mibs was outdated 
But the new method was already documented
https://help.datadoghq.com/hc/en-us/articles/115003480071-Using-your-own-MIB-with-Datadog-agent-v5-14-x-onwards
DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core