Subject: [quicwg/base-drafts] 3008ca: Add subsections to Retry packet section

From: Martin Thomson <[email-masked]>
Date: Wed, 08 Apr 2020 00:31:13 -0700

Branch: refs/heads/retry-split
  Home:   https://github.com/quicwg/base-drafts
  Commit: 3008ca37d95858b854becef833957a150e602abb
      https://github.com/quicwg/base-drafts/commit/3008ca37d95858b854becef833957a150e602abb
  Author: Martin Thomson <[email-masked]>
  Date:   2020-04-08 (Wed, 08 Apr 2020)

  Changed paths:
    M draft-ietf-quic-transport.md

  Log Message:
  -----------
  Add subsections to Retry packet section

This was getting a little long.  You could get lost in there.

The text was fine, it was mostly well structured.  All it needed was one
small move and some headers.