Docs: add description again to individual tagrenderings

Docs/Layers/artwork.md

@@ -15,6 +15,7 @@ An open map of statues, busts, graffitis and other artwork all over the world
 
 
   - This layer is shown at zoomlevel **12** and higher
+  - This layer will automatically load  [walls_and_buildings](./walls_and_buildings.md)  into the layout as it depends on it:  a preset snaps to this layer (presets[1])
 
 
 
@@ -83,6 +84,8 @@ attribute | type | values which are supported by this layer
 
 
 
+This block shows the known images which are linked with the `image`-keys, but also via `mapillary` and `wikidata`
+
 This tagrendering has no question and is thus read-only
 
 
@@ -174,6 +177,8 @@ This tagrendering has labels  `artwork-question`
 
 
 
+Shows a wikipedia box with the corresponding wikipedia article; the wikidata-item link can be changed by a contributor
+
 The question is  *What is the corresponding Wikidata entity?*
 
 This rendering asks information about the property  [wikidata](https://wiki.openstreetmap.org/wiki/Key:wikidata) 
@@ -430,6 +435,8 @@ This tagrendering has no question and is thus read-only
 
 
 
+Shows a small map with the feature. Added by default to every popup
+
 This tagrendering has no question and is thus read-only
 
 
@@ -470,6 +477,8 @@ This tagrendering has no question and is thus read-only
 
 
 
+Gives some metainfo about the last edit and who did edit it - rendering only
+
 This tagrendering has no question and is thus read-only