Fix bullet point in date_time request option reference (valhalla#4914)

docs/docs/api/turn-by-turn/api-reference.md

@@ -347,7 +347,7 @@ For example a bus request with the result in Spanish using the OSRM (Open Source
 | :------------------ | :----------- |
 | `exclude_locations` |  A set of locations to exclude or avoid within a route can be specified using a JSON array of avoid_locations. The avoid_locations have the same format as the locations list. At a minimum each avoid location must include latitude and longitude. The avoid_locations are mapped to the closest road or roads and these roads are excluded from the route path computation.|
 | `exclude_polygons` |  One or multiple exterior rings of polygons in the form of nested JSON arrays, e.g. `[[[lon1, lat1], [lon2,lat2]],[[lon1,lat1],[lon2,lat2]]]`. Roads intersecting these rings will be avoided during path finding. If you only need to avoid a few specific roads, it's **much** more efficient to use `exclude_locations`. Valhalla will close open rings (i.e. copy the first coordinate to the last position).|
-| `date_time` | This is the local date and time at the location.<ul><li>`type`<ul><li>0 - Current departure time.</li><li>1 - Specified departure time</li><li>2 - Specified arrival time. Not yet implemented for multimodal costing method.</li></li>3 - Invariant specified time. Time does not vary over the course of the path. Not implemented for multimodal or bike share routing</li></ul></li><li>`value` - the date and time is specified in ISO 8601 format (YYYY-MM-DDThh:mm) in the local time zone of departure or arrival.  For example "2016-07-03T08:06"</li></ul><br> |
+| `date_time` | This is the local date and time at the location.<ul><li>`type`<ul><li>0 - Current departure time.</li><li>1 - Specified departure time</li><li>2 - Specified arrival time. Not yet implemented for multimodal costing method.</li><li>3 - Invariant specified time. Time does not vary over the course of the path. Not implemented for multimodal or bike share routing</li></ul></li><li>`value` - the date and time is specified in ISO 8601 format (YYYY-MM-DDThh:mm) in the local time zone of departure or arrival.  For example "2016-07-03T08:06"</li></ul><br> |
 | `elevation_interval` | Elevation interval (meters) for requesting elevation along the route. Valhalla data must have been generated with elevation data. If no `elevation_interval` is specified, no elevation will be returned for the route. An elevation interval of 30 meters is recommended when elevation along the route is desired, matching the default data source's resolution. |
 | `id` | Name your route request. If `id` is specified, the naming will be sent thru to the response. |
 | `linear_references` | When present and `true`, the successful `route` response will include a key `linear_references`. Its value is an array of base64-encoded [OpenLR location references][openlr], one for each graph edge of the road network matched by the input trace. |