[docs] Correct `linux_proc_extras` config instructions in readme (#1421)
[docs] Correct `linux_proc_extras` config instructions in readme (#1421)

The check doesn't take any host/port option.
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