Fix anchor links in api docs (#5235)

docs/nodejs/api.md

@@ -322,16 +322,14 @@ osrm.route(options, { format: "json_buffer" }, function(err, response) {
 
 ## Responses
 
-Responses
-
 ### Route
 
 Represents a route through (potentially multiple) waypoints.
 
 **Parameters**
 
--   `exteral` **documentation** in
+-   **documentation** in
-    [`osrm-backend`](../http.md#route)
+    [`osrm-backend`](../http.md#route-object)
 
 ### RouteLeg
 
@@ -339,8 +337,8 @@ Represents a route between two waypoints.
 
 **Parameters**
 
--   `exteral` **documentation** in
+-   **documentation** in
-    [`osrm-backend`](../http.md#routeleg)
+    [`osrm-backend`](../http.md#routeleg-object)
 
 ### RouteStep
 
@@ -349,15 +347,15 @@ single way to the subsequent step.
 
 **Parameters**
 
--   `exteral` **documentation** in
+-   **documentation** in
-    [`osrm-backend`](https://github.com/Project-OSRM/osrm-backend/blob/master/docs/http.md#routestep)
+    [`osrm-backend`](../http.md#routestep-object)
 
 ### StepManeuver
 
 **Parameters**
 
--   `exteral` **documentation** in
+-   **documentation** in
-    [`osrm-backend`](https://github.com/Project-OSRM/osrm-backend/blob/master/docs/http.md#stepmaneuver)
+    [`osrm-backend`](../http.md#stepmaneuver-object)
 
 ### Waypoint
 
@@ -365,5 +363,5 @@ Object used to describe waypoint on a route.
 
 **Parameters**
 
--   `exteral` **documentation** in
+-   **documentation** in
-    [`osrm-backend`](https://github.com/Project-OSRM/osrm-backend/blob/master/docs/http.md#waypoint)
+    [`osrm-backend`](../http.md#waypoint-object)