Switch from node man to node --help

docs/api/chrome-command-line-switches.md

@@ -45,7 +45,7 @@ Electron if you want to enable the `flags` in the main process.
 $ electron --js-flags="--harmony_proxies --harmony_collections" your-app
 ```
 
-See the [Node documentation][node-cli] or run `node man` in your terminal for a list of available flags. Additionally, run `node --v8-options` to see a list of flags that specifically refer to Node's V8 JavaScript engine.
+See the [Node documentation][node-cli] or run `node --help` in your terminal for a list of available flags. Additionally, run `node --v8-options` to see a list of flags that specifically refer to Node's V8 JavaScript engine.
 
 ## --proxy-server=`address:port`