title: How to run godoc on some popular go repo?
body: <p>New godoc have some nice features like list of callers etc. Anyway I have problems to run it, like:</p>
  
  <pre><code>➜  ~GOPATH git:(master) ✗ ls src/github.com/coreos/etcd/
  CHANGELOG       DCO             Documentation   README.md       bench           build           contrib         error           fixtures        go_version.go   http            main.go         mod             scripts         store           tests
  CONTRIBUTING.md Dockerfile      LICENSE         Vagrantfile     bin             config          discovery       etcd            foo             gopath          log             metrics         pkg             server          test.sh         third_party
  ➜  ~GOPATH git:(master) ✗ godoc github.com/coreos/etcd/discovery -http=:6060
  No match found.
  </code></pre>
  
  <p>Does anyone can tell me how to run it on some popular go repos like etcd, which I am using above?</p>