Update digitizingdrainagechannel.rst

docs/en/user-guide/digitizing/digitizingdrainagechannel.rst

@@ -23,5 +23,5 @@ or
 .. figure:: images/digitize_detail_geom_select1.jpg
 
 * You can now start digitizing: draw a simple line with two clicks.
-* The polygon with a width of 20 cm is created in the **wastewater_structure** layer (layergroup Wastewater Structures)
+* The polygon with a width of 20 cm is created in the **vw_wastewater_structure** layer (layergroup Wastewater Structures)
 * In order to alter the width, press Ctrl during digitizing. After the second click, alter the width in the popup window.