Update dirt with snow

helptexts.lua

@@ -129,7 +129,7 @@ local export_longdesc = {
 	["default:dirt_with_rainforest_litter"] = S("This block is found on the surface of rainforests. It is a resourceful block which supports the growth and spreading of many small plants and trees."),
 	["default:dirt_with_grass_footsteps"] = S("A decorational variant of dirt with grass, it looks like someone has stepped on the grass. Unlike dirt with grass, it doesn't change on its own and doesn't spread its grass on other dirt blocks."),
 	["default:dirt_with_dry_grass"] = S("Common on the surface, found in savannahs."),
-	["default:dirt_with_snow"] = S("Dirt with a snow cover, found in cold regions."),
+	["default:dirt_with_snow"] = S("Dirt with snow is a cold block of frozen dirt which doesn't support the growth of any plants. Plants won't die on it, but they don't grow or spread either."),
 	["default:snow"] = S("A thin layer of snow. When it it on top of dirt, the dirt will slowly turn into dirt with snow. When snow lands on dirt with grass, it immediately turns into dirt with snow."),
 	["default:snowblock"] = S("A very thick layer of snow, filling an entire block. Snow this thick can usually only be found in arctic regions. When this block is placed on top of dirt with grass, the dirt with grass turns into dirt with snow."),
 	["default:ice"] = S("Ice is found in arctic regions. It can appear either in huge glacier formations below snow blocks, or above water."),