Document messaging syntax for onion based channels#12

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AdamISZ wants to merge 3 commits intomasterfrom

add-onion-messaging

Commits on Feb 24, 2022

Document messaging syntax for onion based channels
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Commits on Mar 11, 2022

address review of @PulpCattel
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Commits on Mar 31, 2022

update handshake to include network
AdamISZ
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