Fix swapped metric descriptions (#4666)
Fix swapped metric descriptions (#4666)

Officially documented at https://github.com/memcached/memcached/blob/master/doc/protocol.txt
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