Subject: [quicwg/base-drafts] 0f170f: Use `L` to represent any type of length

From: Martin Thomson <[email-masked]>
Date: Wed, 06 Jan 2021 14:39:54 -0800

Branch: refs/heads/length-notation
  Home:   https://github.com/quicwg/base-drafts
  Commit: 0f170f0dcb826604415e8f79f842902083ca7c7e
      https://github.com/quicwg/base-drafts/commit/0f170f0dcb826604415e8f79f842902083ca7c7e
  Author: Martin Thomson <[email-masked]>
  Date:   2021-01-07 (Thu, 07 Jan 2021)

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

  Log Message:
  -----------
  Use `L` to represent any type of length

As suggested by Éric.

Closes #4540.