Update Gruntfile.js

[RohitPaul0007]

Resolves #[Add issue number here]

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PR Checklist

• npm run lint passes
• Inline documentation is included / updated
• Unit tests are included / updated

[Qianqianye]

Thanks @RohitPaul0007. According to the documentation_style_guide.md#comments session written by @nickmcintyre, we will use // for multiline comments. So I will suggest to close this PR. What do you think @nickmcintyre?

[nickmcintyre]

Thanks @RohitPaul0007! As @Qianqianye mentioned, we tend to use single line comments //. The big exception there is inline documentation which has to use /** */. Let's go ahead and close this pull request. I'd love your help with revising examples if you're interested!