kube2sky readme: fix flags

cluster/addons/dns/kube2sky/README.md

@@ -10,28 +10,28 @@ containers.
 ## Namespaces
 
 Kubernetes namespaces become another level of the DNS hierarchy.  See the
-description of `-domain` below.
+description of `--domain` below.
 
 ## Flags
 
-`-domain`: Set the domain under which all DNS names will be hosted.  For
+`--domain`: Set the domain under which all DNS names will be hosted.  For
 example, if this is set to `kubernetes.io`, then a service named "nifty" in the
 "default" namespace would be exposed through DNS as
 "nifty.default.svc.kubernetes.io".
 
-`-v`: Set logging level
+`--v`: Set logging level
 
-`-etcd-mutation-timeout`: For how long the application will keep retrying etcd
+`--etcd-mutation-timeout`: For how long the application will keep retrying etcd
 mutation (insertion or removal of a dns entry) before giving up and crashing.
 
-`-etcd-server`: The etcd server that is being used by skydns.
+`--etcd-server`: The etcd server that is being used by skydns.
 
-`-kube-master-url`: URL of kubernetes master. Required if `--kubecfg_file` is not set.
+`--kube-master-url`: URL of kubernetes master. Required if `--kubecfg_file` is not set.
 
-`-kubecfg-file`: Path to kubecfg file that contains the master URL and tokens to authenticate with the master.
+`--kubecfg-file`: Path to kubecfg file that contains the master URL and tokens to authenticate with the master.
 
-`-log-dir`: If non empty, write log files in this directory
+`--log-dir`: If non empty, write log files in this directory
 
-`-logtostderr`: Logs to stderr instead of files
+`--logtostderr`: Logs to stderr instead of files
 
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