[GRASS-git] [OSGeo/grass] 50c3e0: fix manual page typo from #846

[Markus Neteler]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass
  Commit: 50c3e0d6efbd9556202b6457675d6ec9a0bc055c
      https://github.com/OSGeo/grass/commit/50c3e0d6efbd9556202b6457675d6ec9a0bc055c
  Author: Markus Neteler <neteler at gmail.com>
  Date:   2020-08-04 (Tue, 04 Aug 2020)

  Changed paths:
    M raster/r.cost/r.cost.html

  Log Message:
  -----------
  fix manual page typo from #846