consolidate the doc attributes to avoid issues with versioning

[pwright]

review b626efa
for opportunities to simplify

consolidate, eg :ServiceRegistryURLVersion: {registry-version}

[apicurio-bot]

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Pinging @jsenko to respond or triage.

[EricWittmann]

Consolidate is great - and also we should figure out if all of the values in b626efa#diff-d623ec7270455f9a9cce5914b500ba5b0ad4b73155f90f644db569e1b8f229b2 are actually needed. For example:

:registry-release: 2.6.1.Final-redhat-00003

This will be hard to keep properly updated I think. Do we need it?