Add spec version

[hwwhww]

Issue

Currently, the documents are not labeled to which spec version they are. That makes it difficult to sync with upstream eth2.0-specs repo, especially the phase 1 specs are in development.

Proposed solution

Pointing out the spec version would be helpful.

[staccDOTsol]

Thank you for bringing this to my attention. I understand the importance of having clear spec version labeling in the documents. This would indeed make it easier for users to sync with the upstream eth2.0-specs repository, especially when specific phases are still under development.

I will make sure to pass this feedback along to the appropriate team so that they can consider implementing this improvement. Your input is greatly appreciated as it helps us enhance the user experience and ensure better synchronization with the latest specifications.