ua conformance criteria should link to manifest processing

[llemeurfr]

In https://w3c.github.io/wpub/#conformance-classes, the words "processing a conforming manifest" point to https://w3c.github.io/wpub/#wp-manifest.
They should rather point to https://w3c.github.io/wpub/#wp-manifest-process.

[wareid]

@mattgarrish is this just a correction to links or something that requires discussion?

[mattgarrish]

It's a WP issue, so not something we need to take up anymore. The conformance classes aren't in the manifest spec.

[iherman]

The pub manifest introduced the conformsTo term and corresponding processing.