doc: move protocol-specific block header section
What
Fixes #3914.
Why
The structure will be more natural and logic.
How
move the section on the protocol-specific header
Manually testing the MR
Check that the changes solve the issue and improve the structure of the doc.
Checklist
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Select as Assignee
the next person who should take action on that MR
Edited by Nic Volanschi