Merge pull request #10074 from gyuho/raft-link

raft: fix link typo

raft/doc.go

@@ -23,7 +23,7 @@ For more details on Raft, see "In Search of an Understandable Consensus Algorith
 
 A simple example application, _raftexample_, is also available to help illustrate
 how to use this package in practice:
-https://go.etcd.io/etcd/tree/master/contrib/raftexample
+https://github.com/etcd-io/etcd/tree/master/contrib/raftexample
 
 Usage