Update http.md

Clarify where optional rotary properties will be added

Author: ghoshkaj

docs/http.md

@@ -576,6 +576,8 @@ step.
 - `mode`: A string signifying the mode of transportation.
 - `maneuver`: A `StepManeuver` object representing the maneuver.
 - `intersections`: A list of `Intersection` objects that are passed along the segment, the very first belonging to the StepManeuver
+- `rotary_name`: The name for the rotary. Optionally included, if the step is a rotary and a rotary name is available.
+- `rotary_pronunciation`: The pronunciation hint of the rotary name. Optionally included, if the step is a rotary and a rotary pronunciation is available.
 
 #### Example
 
@@ -630,7 +632,7 @@ step.
 - `bearing_after`: The clockwise angle from true north to the
   direction of travel immediately after the maneuver.  Range 0-359.
 - `type` A string indicating the type of maneuver. **new identifiers might be introduced without API change**
-   Types  unknown to the client should be handled like the `turn` type, the existance of correct `modifier` values is guranteed.
+   Types  unknown to the client should be handled like the `turn` type, the existence of correct `modifier` values is guranteed.
 
 | `type`           | Description                                                  |
 |------------------|--------------------------------------------------------------|
@@ -646,8 +648,8 @@ step.
 | `end of road`    | road ends in a T intersection turn in direction of `modifier`|
 | `use lane`       | going straight on a specific lane                            |
 | `continue`       | Turn in direction of `modifier` to stay on the same road     |
-| `roundabout`     | traverse roundabout, has additional property `exit` with NR if the roundabout is left. `the modifier specifies the direction of entering the roundabout` |
-| `rotary`         | a traffic circle. While very similar to a larger version of a roundabout, it does not necessarily follow roundabout rules for right of way. It can offer `rotary_name/rotary_pronunciation` in addition to the `exit` parameter.  |
+| `roundabout`     | traverse roundabout, has additional property `exit` with NR if the roundabout is left. The modifier specifies the direction of entering the roundabout. |
+| `rotary`         | a traffic circle. While very similar to a larger version of a roundabout, it does not necessarily follow roundabout rules for right of way. It can offer `rotary_name` and/or `rotary_pronunciation` parameters (located in the RouteStep object) in addition to the `exit` parameter (located on the StepManeuver object).  |
 | `roundabout turn`| Describes a turn at a small roundabout that should be treated as normal turn. The `modifier` indicates the turn direciton. Example instruction: `At the roundabout turn left`. |
 | `notification`   | not an actual turn but a change in the driving conditions. For example the travel mode.  If the road takes a turn itself, the `modifier` describes the direction |