Adjust 'grabfood-bundle-size' post

[nossbigg]

@Shu Juan Cheong

Hello Shu Juan! 👋

I was cloning the 'grabfood-bundle-size' post to my own blog, and I observed some errors along the way.

Hope it's ok with you and your team to accept my edit suggestions 🙂 Thank you! 🙇‍♂️