content(learn cli): add shebang link

apps/site/pages/en/learn/command-line/run-nodejs-scripts-from-the-command-line.md

@@ -14,7 +14,7 @@ If your main Node.js application file is `app.js`, you can call it by typing:
 node app.js
 ```
 
-Above, you are explicitly telling the shell to run your script with `node`. You can also embed this information into your JavaScript file with a "shebang" line. The "shebang" is the first line in the file, and tells the OS which interpreter to use for running the script. Below is the first line of JavaScript:
+Above, you are explicitly telling the shell to run your script with `node`. You can also embed this information into your JavaScript file with a ["shebang"](https://en.wikipedia.org/wiki/Shebang_(Unix)) line. The "shebang" is the first line in the file, and tells the OS which interpreter to use for running the script. Below is the first line of JavaScript:
 
 ```js
 #!/usr/bin/node