Fixed one incorrect default value for config parameter 'self_hostname' in forward input plugin doc. Fixes #2256. (#2257)

Fixed one incorrect default value for config parameter 'self_hostname' in forward input plugin doc. Fixes #2256. 

Signed-off-by: Eric D. Schabell <[email protected]>

Author: eschabell

pipeline/inputs/forward.md

@@ -14,7 +14,7 @@ The plugin supports the following configuration parameters:
 | `listen`            | Listener network interface.                                                                                                                                                                                                                                                                                                                | `0.0.0.0` |
 | `port`              | TCP port to listen for incoming connections.                                                                                                                                                                                                                                                                                               | `24224`   |
 | `security.users`    | Specify the username and password pairs for secure forward authentication. Requires `shared_key` or `empty_shared_key` to be set.                                                                                                                                                                                                          |           |
-| `self_hostname`     | Hostname for secure forward authentication.                                                                                                                                                                                                                                                                                                | _none_    |
+| `self_hostname`     | Hostname for secure forward authentication.                                                                                                                                                                                                                                                                                                | `localhost` |
 | `shared_key`        | Shared key for secure forward authentication.                                                                                                                                                                                                                                                                                              | _none_    |
 | `tag`               | Override the tag of the forwarded events with the defined value.                                                                                                                                                                                                                                                                           | _none_    |
 | `tag_prefix`        | Prefix incoming tag with the defined value.                                                                                                                                                                                                                                                                                                | _none_    |