service: improve documentation of ListGoroutines
service: improve documentation of ListGoroutines

Describe how the Start and Count parameters of ListGoroutines are used.

dr2chase/delve,derekparker/delve,aarzilli/delve,go-delve/delve,go-delve/delve,alexbrainman/delve,derekparker/delve,go-delve/delve,go-delve/delve,alexbrainman/delve,go-delve/delve,derekparker/delve,dr2chase/delve,dr2chase/delve,alexbrainman/delve,aarzilli/delve,aarzilli/delve,aarzilli/delve