Clarify etldoc for place layer

layers/place/city.sql

@@ -1,10 +1,10 @@
 
--- etldoc: layer_city[shape=record fillcolor=lightpink, style="rounded,filled",  
--- etldoc:     label="layer_city | <z2_7> z2-z7 | <z8_14_> z8_z14_   " ] ;
+-- etldoc: layer_city[shape=record fillcolor=lightpink, style="rounded,filled",
+-- etldoc:     label="layer_city | <z2_14> z2-z14" ] ;
 
+-- etldoc: osm_city_point -> layer_city:z2_14
 CREATE OR REPLACE FUNCTION layer_city(bbox geometry, zoom_level int, pixel_width numeric)
 RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, place city_place, "rank" int, capital int) AS $$
-    -- etldoc: osm_city_point -> layer_city:z2_7              
     SELECT osm_id, geometry, name, COALESCE(NULLIF(name_en, ''), name) AS name_en, place, "rank", normalize_capital_level(capital) AS capital
     FROM osm_city_point
     WHERE geometry && bbox
@@ -26,7 +26,6 @@ RETURNS TABLE(osm_id bigint, geometry geometry, name text, name_en text, place c
         population DESC NULLS LAST,
         length(name) ASC
       )::int AS gridrank
-    -- etldoc: osm_city_point -> layer_city:z8_14_                          
         FROM osm_city_point
         WHERE geometry && bbox
           AND ((zoom_level = 8 AND place <= 'town'::city_place

layers/place/mapping.yaml

@@ -47,7 +47,7 @@ tables:
       place:
       - country
 
-  # etldoc: imposm3 -> osm_state_point 
+  # etldoc: imposm3 -> osm_state_point
   state_point:
     type: point
     fields:
@@ -74,7 +74,7 @@ tables:
       place:
       - state
 
-  # etldoc: imposm3 -> osm_city_point      
+  # etldoc: imposm3 -> osm_city_point
   city_point:
     type: point
     fields: