fixup! chp2p: add chapter outline for p2p chapter

p2p.asciidoc

@@ -4,23 +4,41 @@ Chapter overview:
 Relevant questions to answer:
   * Encrypted P2P Transport:
       * What is the noise protocol? How does it differ from TLS? Who created it
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       * and what are some of primary design principles?
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       * What is an authenticated key exchange?
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       * Why does Noise offer various handshakes? What are some of unique properties certain handshakes offer?
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       * What is key rotation in the context of a complete handshake? Why is it important?
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       * What is "brontide"? How is it used in LN today? How can it be upgraded in the future?
   * LN Message Format:
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       * What kind of framing is used in the LN message format? What's the max message size and why is it in place?
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       * What is a varint? Why is it used in the protocol?
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       * What are the message types of some of the popular messages in the protocol?
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       * How can new messages be added in the future?
   * Feature bits:
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       * What are feature bits in the network, and how+where are they advertised?
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       * How can feature bits be used to phase in new features to the protocol?
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       * Today, what are some of the major feature bits used in the system?
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       * What's the difference between and end-to-end network upgrade and an internal network upgrade? How's the analogous to the evolution of routers and protocols in the existing internet?
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   * TLV Message Extensions:
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       * What does TLV stand for?
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       * How is this related to the existing protobuf message format?
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       * Where are TLV fields used in the protocol today?
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       * How can TLV fields be used to extend the protocol, existing messages, and the onion itself?