finish tools docs

website/src/lib/docs/en/toolbar/clean.mdx

@@ -9,6 +9,10 @@ title: Clean
 
 # <SquareDashedMousePointer size="24" class="inline-block" style="margin-bottom: 5px" /> { title }
 
+When the clean tool is selected, dragging the map will create a rectangle selection.
+
+Depending on the options selected in the dialog shown below, clicking the delete button will remove GPS points and/or [points of interest](../gpx) located either inside or outside the selection.
+
 <div class="flex flex-row justify-center">
     <Clean class="text-foreground p-3 border rounded-md shadow-lg" />
 </div>