Update data-types.md

Added conditionally required fields and language

Signed-off-by: Michael Schwartz <michael@ridereportapp.com>

Author: mschwartzie

data-types.md

@@ -182,10 +182,10 @@ Stops describe vehicle trip start and end locations in a pre-designated physical
 | `post_code`              | String                                                | Optional | Postal code (e.g. `10036`) |
 | `rental_methods`         | [Enum[]][gbfs-station-info]                           | Optional | List of payment methods accepted at stop, see [GBFS Rental Methods][gbfs-station-info] |
 | `cross_street`           | String                                                | Optional | Cross street of where the station is located. |
-| `num_places_available`   | {vehicle_type: number}                                | Optional | How many places are free to be populated with vehicles at this stop? |
-| `num_places_disabled`    | {vehicle_type: number}                                | Optional | How many places are disabled and unable to accept vehicles at this stop? |
+| `num_places_available`   | {vehicle_type: number}                                | Conditionally Required | How many places are free to be populated with vehicles at this stop? Required if the number of places available are measured as part of contract compliance or service level agreement.|
+| `num_places_disabled`    | {vehicle_type: number}                                | Conditionally Required | How many places are disabled and unable to accept vehicles at this stop? Required if the number of places available are measured as part of contract compliance or service level agreement.|
 | `parent_stop`            | UUID                                                  | Optional | Describe a basic hierarchy of stops (e.g.a stop inside of a greater stop) |
-| `devices`                | UUID[]                                                | Optional | List of device_ids for vehicles which are currently at this stop |
+| `devices`                | UUID[]                                                | Conditionally Required | List of device_ids for vehicles which are currently at this stop. Required if the number of station based devices or number of spaces available are measured as part of contract compliance or service level agreement. |
 | `image_url`              | URL                                                   | Optional | Link to an image, photo, or diagram of the stop. Could be used by providers to help riders find or use the stop. |
 
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