doc: update plugin management commands

docs/plugins.md

@@ -191,30 +191,30 @@ Installed plugin packages are automatically loaded when Poetry starts up.
 
 
 You have multiple ways to install plugins for Poetry
 You have multiple ways to install plugins for Poetry
 
 
-### The `plugin add` command
+### The `self add` command
 
 
 This is the easiest way and should account for all the ways Poetry can be installed.
 This is the easiest way and should account for all the ways Poetry can be installed.
 
 
 ```bash
 ```bash
-poetry plugin add poetry-plugin
+poetry self add poetry-plugin
 ```
 ```
 
 
-The `plugin add` command will ensure that the plugin is compatible with the current version of Poetry
+The `self add` command will ensure that the plugin is compatible with the current version of Poetry
 and install the needed packages for the plugin to work.
 and install the needed packages for the plugin to work.
 
 
-The package specification formats supported by the `plugin add` command are the same as the ones supported
+The package specification formats supported by the `self add` command are the same as the ones supported
 by the [`add` command]({{< relref "cli#add" >}}).
 by the [`add` command]({{< relref "cli#add" >}}).
 
 
-If you no longer need a plugin and want to uninstall it, you can use the `plugin remove` command.
+If you no longer need a plugin and want to uninstall it, you can use the `self remove` command.
 
 
 ```shell
 ```shell
-poetry plugin remove poetry-plugin
+poetry self remove poetry-plugin
 ```
 ```
 
 
 You can also list all currently installed plugins by running:
 You can also list all currently installed plugins by running:
 
 
 ```shell
 ```shell
-poetry plugin show
+poetry self show
 ```
 ```
 
 
 ### With `pipx inject`
 ### With `pipx inject`