[8.x] [Docs] Update community plugins documentation (#197569) (#197736)

# Backport

This will backport the following commits from `main` to `8.x`:
- [[Docs] Update community plugins documentation
(#197569)](#197569)

<!--- Backport version: 9.4.3 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

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Co-authored-by: florent-leborgne <[email protected]>

Author: kibanamachine

docs/user/plugins.asciidoc

@@ -18,7 +18,8 @@ Plugin developers must release a new version of their plugin for each new {kib}
 == Known plugins
 
 The known plugins were tested for {kib} *5.x*, so we are unable to guarantee compatibility with your version of {kib}. The {kib} installer rejects any plugins that haven't been published for your specific version of {kib}. 
-We are unable to evaluate or maintain the known plugins, so care should be taken before installation.
+
+IMPORTANT: Known plugins are developed and maintained outside of Elastic. They are not supported by Elastic. If you encounter an issue with a community plugin, contact the plugin's owner.
 
 [float]
 === Apps
@@ -182,4 +183,4 @@ you must specify the path to that configuration file each time you use the `bin/
 0:: Success
 64:: Unknown command or incorrect option parameter
 74:: I/O error
-70:: Other error
+70:: Other error