pipeline: outputs: vivo-exporter: Add info about workers

Signed-off-by: Alexa Kreizinger <alexakreizinger@gmail.com>

Author: alexakreizinger

pipeline/outputs/vivo-exporter.md

@@ -9,6 +9,8 @@ Vivo Exporter is an output plugin that exposes logs, metrics, and traces through
 | `empty_stream_on_read`   | If enabled, when an HTTP client consumes the data from a stream, the stream content will be removed.                                   | Off     |
 | `stream_queue_size`      | Specify the maximum queue size per stream. Each specific stream for logs, metrics and traces can hold up to `stream_queue_size` bytes. | 20M     |
 | `http_cors_allow_origin` | Specify the value for the HTTP Access-Control-Allow-Origin header (CORS).                                                              |         |
+| `workers` | The number of [workers](../../administration/multithreading.md#outputs) to perform flush operations for this output. | `1` |
+
 
 ### Getting Started