fix(docs): Remove redundant "in" from plugins introduction (#3333)

docs/docs/guides/developer-guide/plugins/index.mdx

@@ -149,7 +149,7 @@ This is the recommended way of creating a new plugin.
 Although the [Vendure CLI](/guides/developer-guide/cli/) is the recommended way to create a new plugin, it can be useful to understand the process of creating
 a plugin manually.
 
-In Vendure **plugins** are used to extend the core functionality of the server. Plugins can be pre-made functionality that you can install via npm, or they can be custom plugins that you write yourself.
+Vendure **plugins** are used to extend the core functionality of the server. Plugins can be pre-made functionality that you can install via npm, or they can be custom plugins that you write yourself.
 
 For any unit of functionality that you need to add to your project, you'll be creating a Vendure plugin. By convention, plugins are stored in the `plugins` directory of your project. However, this is not a requirement, and you are free to arrange your plugin files in any way you like.