Add description of js native helper

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• [ ] 📝 Update the file src/nativeHelpers.js in the squirrelly repository (press the little pen Icon) and edit the line as shown below.

@@ -43,7 +43,7 @@ var nativeHelpers = {
       return ''
     }
   },
-  js: {
+  js: { // The js self-closing helper allows you to inject JavaScript straight into your template function
     selfClosing: function (param) {
       return param + ';'
     }

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This issue was created by First-Timers-Bot.

[nebrelbug]

In addition, there needs to be a newline at the end of the file.

[vidushi4]

Hi, I've created a PR for the same. Please review. Thank you