document running pods and containers (#2792)
document running pods and containers (#2792)

Ref: https://github.com/DataDog/integrations-core/pull/2191/files
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