Merge pull request #56 from noahsprent/fix_plugin_typo

Fix plugin/plugins typo

Author: CamDavidsonPilon

user-guide/03-Extending your Pioreactor/06a-using-community-plugins.mdx

@@ -48,7 +48,7 @@ You can uninstall plugins from the same page, too. These will remove the action
  2. To get this .whl file onto a Pioreactor, use either `scp`, WinSCP, or FileZilla. Note: if you upload the .whl file to your leader Pioreactor first, you can distribute the .whl file to all your workers with `pios cp <location of .whl file>`
  3. Once the .whl file is on the Pioreactor, use the following to install the plugin:
     ```
-    pio plugin install <name-of-plugin> --source <location of .whl file>
+    pio plugins install <name-of-plugin> --source <location of .whl file>
     ```
     For example:
     ```
@@ -57,4 +57,4 @@ You can uninstall plugins from the same page, too. These will remove the action
 
 ## Alternative: putting Python files in the the `plugins` folder
 
-An alternative way to install a plugin is to place a Python file in the `/home/pioreactor/.pioreactor/plugins` directory on the Raspberry Pi. This is good for one-off scripts or plugins you are demoing or testing. See more [about writing and distributing plugins](/developer-guide/intro-plugins).
+An alternative way to install a plugin is to place a Python file in the `/home/pioreactor/.pioreactor/plugins` directory on the Raspberry Pi. This is good for one-off scripts or plugins you are demoing or testing. See more [about writing and distributing plugins](/developer-guide/intro-plugins).