add docs for tags... (#2668)
add docs for tags... (#2668)

they appear to be supported: https://github.com/DataDog/dd-agent/blob/master/checks.d/etcd.py#L76

so, let's add them in the example yaml
Wattpad/dd-agent,takus/dd-agent,takus/dd-agent,jyogi/purvar-agent,indeedops/dd-agent,jyogi/purvar-agent,indeedops/dd-agent,manolama/dd-agent,manolama/dd-agent,takus/dd-agent,takus/dd-agent,indeedops/dd-agent,cberry777/dd-agent,Wattpad/dd-agent,indeedops/dd-agent,manolama/dd-agent,cberry777/dd-agent,cberry777/dd-agent,manolama/dd-agent,Wattpad/dd-agent,Wattpad/dd-agent,jyogi/purvar-agent,jyogi/purvar-agent,takus/dd-agent,cberry777/dd-agent,jyogi/purvar-agent,Wattpad/dd-agent,manolama/dd-agent,indeedops/dd-agent,cberry777/dd-agent