rpc: add version info to the table

Signed-off-by: Daijiro Fukuda <fukuda@clear-code.com>
Co-authored-by: Kentaro Hayashi <kenhys@gmail.com>

Author: daipom

deployment/rpc.md

@@ -25,20 +25,19 @@ As evident from the output above, each endpoint returns a JSON object as its res
 
 ## HTTP Endpoints
 
-| Endpoint | Replacement of | Description |
-| :--- | :---: | :---: |
-| `/api/processes.interruptWorkers` | [SIGINT](signals.md#sigint-or-sigterm) | Stops the daemon. |
-| `/api/processes.killWorkers` | [SIGTERM](signals.md#sigint-or-sigterm) | Stops the daemon. |
-| `/api/processes.zeroDowntimeRestart` | [SIGUSR2](signals.md#sigusr2) | Restarts Fluentd with zero-downtime. |
-| `/api/processes.flushBuffersAndKillWorkers` | [SIGUSR1](signals.md#sigusr1) and [SIGTERM](signals.md#sigint-or-sigterm) | Flushes buffer and stops the daemon. |
-| `/api/plugins.flushBuffers` | [SIGUSR1](signals.md#sigusr1) | Flushes the buffered messages. |
-| `/api/config.reload` | [SIGHUP](signals.md#sighup) | Reloads configuration. |
-| `/api/config.gracefulReload` | --- | Reloads configuration. |
+| Endpoint                                    | Replacement of                                                            | Description                                                     | Version |
+| :---                                        | :---:                                                                     | :---:                                                           |         |
+| `/api/processes.interruptWorkers`           | [SIGINT](signals.md#sigint-or-sigterm)                                    | Stops the daemon.                                               | v1.0    |
+| `/api/processes.killWorkers`                | [SIGTERM](signals.md#sigint-or-sigterm)                                   | Stops the daemon.                                               | v1.0    |
+| `/api/processes.zeroDowntimeRestart`        | [SIGUSR2](signals.md#sigusr2)                                             | Restarts Fluentd with zero-downtime. (Not supported on Windows) | v1.18   |
+| `/api/processes.flushBuffersAndKillWorkers` | [SIGUSR1](signals.md#sigusr1) and [SIGTERM](signals.md#sigint-or-sigterm) | Flushes buffer and stops the daemon.                            | v1.0    |
+| `/api/plugins.flushBuffers`                 | [SIGUSR1](signals.md#sigusr1)                                             | Flushes the buffered messages.                                  | v1.0    |
+| `/api/config.reload`                        | [SIGHUP](signals.md#sighup)                                               | Reloads configuration.                                          | v1.0    |
+| `/api/config.gracefulReload`                | ---                                                                       | Reloads configuration.                                          | v1.9    |
 
 Appendix:
 
-* `/api/processes.zeroDowntimeRestart`: This is supported since v1.18.0 on non-Windows.
-* `/api/config.gracefulReload`: This is the replacement of `SIGUSR2` before v1.18.0. Please use `/api/processes.zeroDowntimeRestart` or `/api/config.reload` unless there is a special reason. See [SIGUSR2](signals.md#sigusr2) for details.
+* `/api/config.gracefulReload`: This is the replacement of `SIGUSR2` before v1.18. Please use `/api/processes.zeroDowntimeRestart` or `/api/config.reload` unless there is a special reason. See [SIGUSR2](signals.md#sigusr2) for details.
 
 If this article is incorrect or outdated, or omits critical information, please [let us know](https://github.com/fluent/fluentd-docs-gitbook/issues?state=open). [Fluentd](http://www.fluentd.org/) is an open-source project under [Cloud Native Computing Foundation \(CNCF\)](https://cncf.io/). All components are available under the Apache 2 License.