Update doc

docs/usage.rst

@@ -4,23 +4,23 @@ Usage
 
 Getting started
 ======
-
 ::
 
-    Usage: tileserver-gl [mbtiles] [options]
-
-    mbtiles     MBTiles file (uses demo configuration);
-                ignored if the configuration file is also specified
+  Usage: main.js tileserver-gl [mbtiles] [options]
 
   Options:
-       -c, --config    Configuration file  [config.json]
-       -b, --bind      Bind address
-       -p, --port      Port  [8080]
+
+    -h, --help            output usage information
+    --mbtiles <file>      MBTiles file (uses demo configuration);
+                          ignored if the configuration file is also specified
+    -c, --config <file>   Configuration file
+    -b, --bind <address>  Bind address
+    -p, --port <port>     Port
+    -C|--no-cors          Disable Cross-origin resource sharing headers
     -V, --verbose         More verbose output
     -v, --version         Version info
 
 
-
 Default styles and configuration
 ======