[GRASS-git] [OSGeo/grass] 275811: r.walk: add screenshot in documentation (#3025)

[Brendan Harmon]

  Branch: refs/heads/releasebranch_8_3
  Home:   https://github.com/OSGeo/grass
  Commit: 2758119410b4ac70fba387957b2398a3d91f16d8
      https://github.com/OSGeo/grass/commit/2758119410b4ac70fba387957b2398a3d91f16d8
  Author: Brendan Harmon <brendan.harmon at gmail.com>
  Date:   2023-06-09 (Fri, 09 Jun 2023)

  Changed paths:
    M raster/r.walk/r.walk.html
    A raster/r.walk/r_walk.png

  Log Message:
  -----------
  r.walk: add screenshot in documentation (#3025)