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Update api.md (#6054)

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* Update api.md

alternatives_count was missing in this document,

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docs/nodejs/api.md
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@ -244,9 +244,16 @@ osrm.match(options, function(err, response) {
Returns **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)** containing `tracepoints` and `matchings`. Returns **[Object](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object)** containing `tracepoints` and `matchings`.
**`tracepoints`** Array of [`Ẁaypoint`](#waypoint) objects representing all points of the trace in order. **`tracepoints`** Array of [`Ẁaypoint`](#waypoint) objects representing all points of the trace in order.
If the trace point was ommited by map matching because it is an outlier, the entry will be null. If the trace point was ommited by map matching because it is an outlier, the entry will be null.
Each `Waypoint` object includes two additional properties, 1) `matchings_index`: Index to the Each `Waypoint` object has the following additional properties,
[`Route`](#route) object in matchings the sub-trace was matched to, 2) `waypoint_index`: Index of
1) `matchings_index`: Index to the
[`Route`](#route) object in matchings the sub-trace was matched to,
2) `waypoint_index`: Index of
the waypoint inside the matched route. the waypoint inside the matched route.
3) `alternatives_count`: Number of probable alternative matchings for this trace point. A value of zero indicate that this point was matched unambiguously. Split the trace at these points for incremental map matching.
**`matchings`** is an array of [`Route`](#route) objects that assemble the trace. Each `Route` object has an additional `confidence` property, **`matchings`** is an array of [`Route`](#route) objects that assemble the trace. Each `Route` object has an additional `confidence` property,
which is the confidence of the matching. float value between `0` and `1`. `1` is very confident that the matching is correct. which is the confidence of the matching. float value between `0` and `1`. `1` is very confident that the matching is correct.