Project and credit class SHACL updates

[blushi]

Description

Ref: https://github.com/regen-network/regen-registry/issues/788

This updates the project and credit class SHACL graphs based on some terminology changes:

FROM: TO:

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Author Checklist

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• [x] provided a link to the relevant issue or specification
• [x] reviewed "Files changed" and left comments if necessary

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• [ ] reviewed documentation is accurate
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[blushi]

Hi @blushi, I'm going to mark as approved. The only thing I'm having a little trouble understanding is where the link for the credit class is located in the spec. Maybe we can talk about this at a later time.

@wgwz The link for the credit class was already specified so you can't see it in the diff: https://github.com/regen-network/regen-registry-standards/blob/4cd6b7bc50a3b79fca9fedf367a43ab346e17c6c/shacl/credit-class.ttl#L15-L18 (while the credit class name is a database column in itself)