Fix typos
Fix inconsistencies
Update links
Nits
Grammar, typos, links, etc.
Update SimpleDNSCrypt URL to https://github.com/instantsc/SimpleDnsCrypt
Update Stamps spec
v2 -> v3
Add SecureDNS
Updated Stamps (markdown)
Clarify bootstrap_ipi
Clarify the stamps specification
HTTP2 -> HTTP/2
More stamps documentation