[Checkins] [zopefoundation/ZEO] 603f6b: Fix variable name in code example

[sblondon]

  Branch: refs/heads/master
  Home:   https://github.com/zopefoundation/ZEO
  Commit: 603f6b6ec1164d1995bdafdb1ec85172514686cd
      https://github.com/zopefoundation/ZEO/commit/603f6b6ec1164d1995bdafdb1ec85172514686cd
  Author: sblondon <sblondon at users.noreply.github.com>
  Date:   2019-12-13 (Fri, 13 Dec 2019)

  Changed paths:
    M README.rst

  Log Message:
  -----------
  Fix variable name in code example 

The variable is named `address` and is called `addr` in the following lines. This PR use `address` consistently.