convert inline code strings to terminal code blocks in Getting Started

[mendelssohnbach]

Thanks for publishing this very informative document.

https://github.com/prisma/docs/blob/ae571304fd49da15382b2874859e22e3488208ef/content/100-getting-started/02-setup-prisma/100-start-from-scratch/120-mongodb/200-install-prisma-client-typescript-mongodb.mdx?plain=1#L24

If you can give us an example of a terminal, can make it clearer.

npx prisma db push