Rename FontLoaderManifest to NextFontManifest and add better comments (#46922)
Rename FontLoaderManifest to NextFontManifest to make it more obvious
that it has to do with `next/font`.
There's a change to how the plugin determines if a module is generated
by `next/font`. Instead of looking at the target CSS file
https://github.com/vercel/next.js/blob/v13.2.4-canary.6/packages/next/src/build/webpack/plugins/font-loader-manifest-plugin.ts#L37-L49.
It simply looks if the module has `next-font-loader` in its loaders:
https://github.com/vercel/next.js/compare/canary...hanneslund:next.js:next-font-build-cleanup?expand=1#diff-34d7972c68687e875c868847f782f369c3af162a9af10949f3577660775afcb2R65-R74
Also more comments added to the manifest plugin and the `next/font`
postcss plugin.
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Co-authored-by: JJ Kasper <jj@jjsweb.site>