[logback-dev] [qos-ch/logback] 1a1985: Fix typo in MDC section

[Miroslav Lehotsky]

  Branch: refs/heads/master
  Home:   https://github.com/qos-ch/logback
  Commit: 1a1985d4095614c44e40bf5be981838a67ac4ca2
      https://github.com/qos-ch/logback/commit/1a1985d4095614c44e40bf5be981838a67ac4ca2
  Author: Miroslav Lehotsky <mlehotsky13 at gmail.com>
  Date:   2021-06-15 (Tue, 15 Jun 2021)

  Changed paths:
    M logback-site/src/site/pages/manual/mdc.html

  Log Message:
  -----------
  Fix typo in MDC section