They are grouped by categories and that hasn't changed, and the order
of groups haven't changed. All occurrences of foo.* variables are sorted
alphabetically instead of approximately by relationship between each
other.

Inside the first group, variables are now ordered based on the PROXY
protocol diagram:

- client
- server
- remote
- local

A note was added and is hopefully visible enough to maintain this order.

You can verify that nothing changed:

    $ COMMIT=<this-commit-hash>
    $ git show $COMMIT~:doc/sphinx/reference/vcl_var.rst |
      sed '/^$/d' |
      sort |
      sha1sum
    3400130e88c0456b3bc779b9dfeeff09e130efa3
    $ git show ${COMMIT}:doc/sphinx/reference/vcl_var.rst |
      sed '/^$/d ; /.. NOTE:/d' |
      sort |
      sha1sum
    3400130e88c0456b3bc779b9dfeeff09e130efa3

Use whatever alternative to sha1sum your system may provide.