Add indication if a mapping cannot be chosen by a contributor

Docs/Layers/crossings.md

@@ -75,11 +75,11 @@ Elements must have the all of following tags to be shown on this layer:
 
 attribute | type | values which are supported by this layer
 ----------- | ------ | ------------------------------------------
-[<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/crossing#values) [crossing](https://wiki.openstreetmap.org/wiki/Key:crossing) | Multiple choice | [uncontrolled](https://wiki.openstreetmap.org/wiki/Tag:crossing%3Duncontrolled) [traffic_signals](https://wiki.openstreetmap.org/wiki/Tag:crossing%3Dtraffic_signals) [zebra](https://wiki.openstreetmap.org/wiki/Tag:crossing%3Dzebra)
+[<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/crossing#values) [crossing](https://wiki.openstreetmap.org/wiki/Key:crossing) | Multiple choice | [uncontrolled](https://wiki.openstreetmap.org/wiki/Tag:crossing%3Duncontrolled) [traffic_signals](https://wiki.openstreetmap.org/wiki/Tag:crossing%3Dtraffic_signals)
 [<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/crossing_ref#values) [crossing_ref](https://wiki.openstreetmap.org/wiki/Key:crossing_ref) | Multiple choice | [zebra](https://wiki.openstreetmap.org/wiki/Tag:crossing_ref%3Dzebra) [](https://wiki.openstreetmap.org/wiki/Tag:crossing_ref%3D)
 [<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/bicycle#values) [bicycle](https://wiki.openstreetmap.org/wiki/Key:bicycle) | Multiple choice | [yes](https://wiki.openstreetmap.org/wiki/Tag:bicycle%3Dyes) [no](https://wiki.openstreetmap.org/wiki/Tag:bicycle%3Dno)
 [<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/crossing:island#values) [crossing:island](https://wiki.openstreetmap.org/wiki/Key:crossing:island) | Multiple choice | [yes](https://wiki.openstreetmap.org/wiki/Tag:crossing:island%3Dyes) [no](https://wiki.openstreetmap.org/wiki/Tag:crossing:island%3Dno)
-[<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/tactile_paving#values) [tactile_paving](https://wiki.openstreetmap.org/wiki/Key:tactile_paving) | Multiple choice | [yes](https://wiki.openstreetmap.org/wiki/Tag:tactile_paving%3Dyes) [no](https://wiki.openstreetmap.org/wiki/Tag:tactile_paving%3Dno) [incorrect](https://wiki.openstreetmap.org/wiki/Tag:tactile_paving%3Dincorrect)
+[<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/tactile_paving#values) [tactile_paving](https://wiki.openstreetmap.org/wiki/Key:tactile_paving) | Multiple choice | [yes](https://wiki.openstreetmap.org/wiki/Tag:tactile_paving%3Dyes) [no](https://wiki.openstreetmap.org/wiki/Tag:tactile_paving%3Dno)
 [<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/button_operated#values) [button_operated](https://wiki.openstreetmap.org/wiki/Key:button_operated) | Multiple choice | [yes](https://wiki.openstreetmap.org/wiki/Tag:button_operated%3Dyes) [no](https://wiki.openstreetmap.org/wiki/Tag:button_operated%3Dno)
 [<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/red_turn:right:bicycle#values) [red_turn:right:bicycle](https://wiki.openstreetmap.org/wiki/Key:red_turn:right:bicycle) | Multiple choice | [yes](https://wiki.openstreetmap.org/wiki/Tag:red_turn:right:bicycle%3Dyes) [yes](https://wiki.openstreetmap.org/wiki/Tag:red_turn:right:bicycle%3Dyes) [no](https://wiki.openstreetmap.org/wiki/Tag:red_turn:right:bicycle%3Dno)
 [<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/red_turn:straight:bicycle#values) [red_turn:straight:bicycle](https://wiki.openstreetmap.org/wiki/Key:red_turn:straight:bicycle) | Multiple choice | [yes](https://wiki.openstreetmap.org/wiki/Tag:red_turn:straight:bicycle%3Dyes) [yes](https://wiki.openstreetmap.org/wiki/Tag:red_turn:straight:bicycle%3Dyes) [no](https://wiki.openstreetmap.org/wiki/Tag:red_turn:straight:bicycle%3Dno)
@@ -99,7 +99,7 @@ The question is **What kind of crossing is this?**
 
   - **Crossing, without traffic lights** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:crossing' target='_blank'>crossing</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:crossing%3Duncontrolled' target='_blank'>uncontrolled</a>
   - **Crossing with traffic signals** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:crossing' target='_blank'>crossing</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:crossing%3Dtraffic_signals' target='_blank'>traffic_signals</a>
-  - **Zebra crossing** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:crossing' target='_blank'>crossing</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:crossing%3Dzebra' target='_blank'>zebra</a>
+  - **Zebra crossing** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:crossing' target='_blank'>crossing</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:crossing%3Dzebra' target='_blank'>zebra</a>_This option cannot be chosen as answer_
 
 
 
@@ -164,7 +164,7 @@ The question is **Does this crossing have tactile paving?**
 
   - **This crossing has tactile paving** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:tactile_paving' target='_blank'>tactile_paving</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:tactile_paving%3Dyes' target='_blank'>yes</a>
   - **This crossing does not have tactile paving** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:tactile_paving' target='_blank'>tactile_paving</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:tactile_paving%3Dno' target='_blank'>no</a>
-  - **This crossing has tactile paving, but is not correct** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:tactile_paving' target='_blank'>tactile_paving</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:tactile_paving%3Dincorrect' target='_blank'>incorrect</a>
+  - **This crossing has tactile paving, but is not correct** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:tactile_paving' target='_blank'>tactile_paving</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:tactile_paving%3Dincorrect' target='_blank'>incorrect</a>_This option cannot be chosen as answer_