Add indication if a mapping cannot be chosen by a contributor

Docs/Layers/tree_node.md

@@ -76,7 +76,7 @@ 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/height#values) [height](https://wiki.openstreetmap.org/wiki/Key:height) | Multiple choice | 
-[<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/leaf_type#values) [leaf_type](https://wiki.openstreetmap.org/wiki/Key:leaf_type) | Multiple choice | [broadleaved](https://wiki.openstreetmap.org/wiki/Tag:leaf_type%3Dbroadleaved) [needleleaved](https://wiki.openstreetmap.org/wiki/Tag:leaf_type%3Dneedleleaved) [leafless](https://wiki.openstreetmap.org/wiki/Tag:leaf_type%3Dleafless)
+[<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/leaf_type#values) [leaf_type](https://wiki.openstreetmap.org/wiki/Key:leaf_type) | Multiple choice | [broadleaved](https://wiki.openstreetmap.org/wiki/Tag:leaf_type%3Dbroadleaved) [needleleaved](https://wiki.openstreetmap.org/wiki/Tag:leaf_type%3Dneedleleaved)
 [<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/denotation#values) [denotation](https://wiki.openstreetmap.org/wiki/Key:denotation) | Multiple choice | [landmark](https://wiki.openstreetmap.org/wiki/Tag:denotation%3Dlandmark) [natural_monument](https://wiki.openstreetmap.org/wiki/Tag:denotation%3Dnatural_monument) [agricultural](https://wiki.openstreetmap.org/wiki/Tag:denotation%3Dagricultural) [park](https://wiki.openstreetmap.org/wiki/Tag:denotation%3Dpark) [garden](https://wiki.openstreetmap.org/wiki/Tag:denotation%3Dgarden) [avenue](https://wiki.openstreetmap.org/wiki/Tag:denotation%3Davenue) [urban](https://wiki.openstreetmap.org/wiki/Tag:denotation%3Durban) [none](https://wiki.openstreetmap.org/wiki/Tag:denotation%3Dnone)
 [<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/leaf_cycle#values) [leaf_cycle](https://wiki.openstreetmap.org/wiki/Key:leaf_cycle) | Multiple choice | [deciduous](https://wiki.openstreetmap.org/wiki/Tag:leaf_cycle%3Ddeciduous) [evergreen](https://wiki.openstreetmap.org/wiki/Tag:leaf_cycle%3Devergreen)
 [<img src='https://mapcomplete.osm.be/assets/svg/statistics.svg' height='18px'>](https://taginfo.openstreetmap.org/keys/name#values) [name](https://wiki.openstreetmap.org/wiki/Key:name) | [string](../SpecialInputElements.md#string) | [](https://wiki.openstreetmap.org/wiki/Tag:name%3D)
@@ -124,7 +124,7 @@ The question is **Is this a broadleaved or needleleaved tree?**
 
   - **<img src="./assets/themes/trees/broadleaved.svg" style="width:1.5em;height:1.5em" alt=""/> Broadleaved** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:leaf_type' target='_blank'>leaf_type</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:leaf_type%3Dbroadleaved' target='_blank'>broadleaved</a>
   - **<img src="./assets/themes/trees/needleleaved.svg" style="width:1.5em;height:1.5em" alt=""/> Needleleaved** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:leaf_type' target='_blank'>leaf_type</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:leaf_type%3Dneedleleaved' target='_blank'>needleleaved</a>
-  - **<img src="./assets/themes/trees/leafless.svg" style="width:1.5em;height:1.5em" alt=""/> Permanently leafless** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:leaf_type' target='_blank'>leaf_type</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:leaf_type%3Dleafless' target='_blank'>leafless</a>
+  - **<img src="./assets/themes/trees/leafless.svg" style="width:1.5em;height:1.5em" alt=""/> Permanently leafless** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:leaf_type' target='_blank'>leaf_type</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:leaf_type%3Dleafless' target='_blank'>leafless</a>_This option cannot be chosen as answer_
 
 
 
@@ -197,7 +197,7 @@ The question is **Is this tree registered heritage?**
   - **Registered as heritage by <i>Direction du Patrimoine culturel</i> Brussels** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:heritage' target='_blank'>heritage</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:heritage%3D4' target='_blank'>4</a>&<a href='https://wiki.openstreetmap.org/wiki/Key:heritage:operator' target='_blank'>heritage:operator</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:heritage:operator%3Daatl' target='_blank'>aatl</a>
   - **Registered as heritage by a different organisation** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:heritage' target='_blank'>heritage</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:heritage%3Dyes' target='_blank'>yes</a>
   - **Not registered as heritage** corresponds with <a href='https://wiki.openstreetmap.org/wiki/Key:heritage' target='_blank'>heritage</a>=<a href='https://wiki.openstreetmap.org/wiki/Tag:heritage%3Dno' target='_blank'>no</a>
-  - **Registered as heritage by a different organisation** corresponds with heritage~^..*$
+  - **Registered as heritage by a different organisation** corresponds with heritage~^..*$_This option cannot be chosen as answer_