Remove invalid warning in keeping-mocks-in-sync.mdx

[Macavirus]

This warning appears to make no sense. It seems that https://github.com/Tapico/tapico-msw-webarchive only supports Nodejs, so the warning is misleading.

[vercel[bot]]

@Macavirus is attempting to deploy a commit to the MSW Team on Vercel.

A member of the Team first needs to authorize it.

[kettanaito]

Thanks for proposing this! I will rewrite this recipe to suggest @msw/source in #509.