[GRASS-git] [OSGeo/grass] b1b5d5: howto_release.md: fix link to latest MD file

[Markus Neteler]

  Branch: refs/heads/releasebranch_7_8
  Home:   https://github.com/OSGeo/grass
  Commit: b1b5d545af6e8cc00baa02d93e2b9985a1086ed4
      https://github.com/OSGeo/grass/commit/b1b5d545af6e8cc00baa02d93e2b9985a1086ed4
  Author: Markus Neteler <neteler at gmail.com>
  Date:   2020-12-21 (Mon, 21 Dec 2020)

  Changed paths:
    M doc/howto_release.md

  Log Message:
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  howto_release.md: fix link to latest MD file