update doc to include --http-endpoint (kubernetes#2667)

Co-authored-by: jichenjc <[email protected]>

Author: k8s-infra-cherrypick-robot

cmd/cinder-csi-plugin/main.go

@@ -64,7 +64,7 @@ func main() {
 	}
 
 	cmd.PersistentFlags().StringVar(&cluster, "cluster", "", "The identifier of the cluster that the plugin is running in.")
-	cmd.PersistentFlags().StringVar(&httpEndpoint, "http-endpoint", "", "The TCP network address where the HTTP server for diagnostics, including metrics and leader election health check, will listen (example: `:8080`). The default is empty string, which means the server is disabled.")
+	cmd.PersistentFlags().StringVar(&httpEndpoint, "http-endpoint", "", "The TCP network address where the HTTP server for providing metrics for diagnostics, will listen (example: `:8080`). The default is empty string, which means the server is disabled.")
 	openstack.AddExtraFlags(pflag.CommandLine)
 
 	code := cli.Run(cmd)

docs/cinder-csi-plugin/using-cinder-csi-plugin.md

@@ -88,6 +88,16 @@ In addition to the standard set of klog flags, `cinder-csi-plugin` accepts the f
 
   This will be added as metadata to every Cinder volume created by this plugin.
   </dd>
+
+  <dt>--http-endpoint &lt;HTTP server&gt;</dt>
+  <dd>
+  This argument is optional.
+
+  The TCP network address where the HTTP server for providing metrics for diagnostics, will listen (example: `:8080`).
+
+  The default is empty string, which means the server is disabled.
+  </dd>
+
 </dl>
 
 ## Driver Config