Fix Specification.html anchor links for web requests

[leskneebone]

VocPub specification requirements have anchor links to assist navigation within the document. However, the anchors do not work for an external request. External linking to specific requirements is needed to support validation tools and documentation.

Example:

https://agldwg.github.io/vocpub-profile/specification.html#2.3.1

The issue is likely to be the frag anchor.
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Suggest updating the anchors to support external web requests.