docs: inputs: prometheus-remote-write: add http_server.workers and note canonical key names

  Add the missing http_server.workers parameter (default: 1) from the
  shared HTTP server integration. Nnote that buffer_chunk_size,
  buffer_max_size, and http2 are compatibility aliases for their
  http_server.* canonical names.

  Applies to #2486

Signed-off-by: Eric D. Schabell <eric@schabell.org>

Author: eschabell

pipeline/inputs/prometheus-remote-write.md

@@ -10,9 +10,10 @@ The _Prometheus remote write_ input plugin lets you ingest a payload in the Prom
 
 | Key                        | Description                                                                                                                                                                                                                                      | Default   |
 |----------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------|
-| `buffer_chunk_size`        | Sets the chunk size for incoming data. These chunks are then stored and managed in the space specified by `buffer_max_size`.                                                                                                                     | `512K`    |
-| `buffer_max_size`          | Specifies the maximum buffer size to receive a request.                                                                                                                                                                                          | `4M`      |
-| `http2`                    | Enable HTTP/2 support.                                                                                                                                                                                                                           | `true`    |
+| `buffer_chunk_size`        | Sets the chunk size for incoming data. These chunks are then stored and managed in the space specified by `buffer_max_size`. Compatibility alias for `http_server.buffer_chunk_size`.                                                            | `512K`    |
+| `buffer_max_size`          | Specifies the maximum buffer size to receive a request. Compatibility alias for `http_server.buffer_max_size`.                                                                                                                                   | `4M`      |
+| `http2`                    | Enable HTTP/2 support. Compatibility alias for `http_server.http2`.                                                                                                                                                                              | `true`    |
+| `http_server.workers`      | Number of HTTP listener worker threads.                                                                                                                                                                                                          | `1`       |
 | `listen`                   | The address to listen on.                                                                                                                                                                                                                        | `0.0.0.0` |
 | `port`                     | The port to listen on.                                                                                                                                                                                                                           | `8080`    |
 | `successful_response_code` | Specifies the success response code. Supported values are `200`, `201`, and `204`.                                                                                                                                                               | `201`     |