m add more of the overmap special flags

doc/JSON_FLAGS.md

@@ -1140,10 +1140,14 @@ These branches are also the valid entries for the categories of `dreams` in `dre
 - ```BEE``` Location is related to bees. Used to classify location.
 - ```BLOB``` Location should "blob" outward from the defined location with a chance to be placed in adjacent locations.
 - ```CLASSIC``` Location is allowed when classic zombies are enabled.
+- ```FARM```
 - ```FUNGAL``` Location is related to fungi. Used to classify location.
-- ```TRIFFID``` Location is related to triffids. Used to classify location.
 - ```LAKE``` Location is is placed on a lake and will be ignored for placement if the overmap doesn't contain any lake terrain.
+- ```MI-GO``` Location is related to mi-go.
+- ```TRIFFID``` Location is related to triffids. Used to classify location.
 - ```UNIQUE``` Location is unique and will only occur once per overmap. `occurrences` is overridden to define a percent chance (e.g. `"occurrences" : [75, 100]` is 75%)
+- ```URBAN```
+- ```WILDERNESS```
 
 ### Overmap terrains