[GRASS-git] [OSGeo/grass] a69135: Improve user message

[Markus Neteler]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass
  Commit: a69135a74fc5c2b2047aea627deaf22be6f7cf4f
      https://github.com/OSGeo/grass/commit/a69135a74fc5c2b2047aea627deaf22be6f7cf4f
  Author: Markus Neteler <neteler at gmail.com>
  Date:   2019-09-20 (Fri, 20 Sep 2019)

  Changed paths:
    M raster/r.proj/main.c

  Log Message:
  -----------
  Improve user message

- clarify source and target numbers, see https://lists.osgeo.org/pipermail/grass-user/2019-September/080832.html