manual: add 'shadow' keyword

git-svn-id: https://svn.osgeo.org/grass/grass/branches/releasebranch_7_0@60134 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.sun/main.c

@@ -237,6 +237,7 @@ int main(int argc, char *argv[])
     G_add_keyword(_("raster"));
     G_add_keyword(_("solar"));
     G_add_keyword(_("sun energy"));
+    G_add_keyword(_("shadow"));
     module->label = _("Solar irradiance and irradiation model.");
     module->description =
 	_("Computes direct (beam), diffuse and reflected solar irradiation raster "

raster/r.sunmask/main.c

@@ -116,6 +116,7 @@ int main(int argc, char *argv[])
     G_add_keyword(_("raster"));
     G_add_keyword(_("solar"));
     G_add_keyword(_("sun position"));
+    G_add_keyword(_("shadow"));
     module->label = _("Calculates cast shadow areas from sun position and elevation raster map.");
     module->description = _("Either exact sun position (A) is specified, or date/time to calculate "
 			    "the sun position (B) by r.sunmask itself.");