Fix default endpoint port (#1490)

plugin/etcd/README.md

@@ -44,7 +44,7 @@ etcd [ZONES...] {
   is authoritative. If specific zones are listed (for example `in-addr.arpa` and `ip6.arpa`), then only
   queries for those zones will be subject to fallthrough.
 * **PATH** the path inside etcd. Defaults to "/skydns".
-* **ENDPOINT** the etcd endpoints. Defaults to "http://localhost:2397".
+* **ENDPOINT** the etcd endpoints. Defaults to "http://localhost:2379".
 * `upstream` upstream resolvers to be used resolve external names found in etcd (think CNAMEs)
   pointing to external names. If you want CoreDNS to act as a proxy for clients, you'll need to add
   the proxy plugin. **ADDRESS** can be an IP address, and IP:port or a string pointing to a file