docs: fix grammar (#5326)

Co-authored-by: Lukas Taegert-Atkinson <lukastaegert@users.noreply.github.com>

docs/configuration-options/index.md

@@ -333,7 +333,7 @@ export default {
 | ----: | :----------------------------------------- |
 | Type: | `MaybeArray<MaybePromise<Plugin \| void>>` |
 
-See [Using plugins](../tutorial/index.md#using-plugins) for more information on how to use plugins and [Plugins](../plugin-development/index.md) on how to write your own (try it out, it's not as difficult as it may sound and very much extends what you can do with Rollup). For plugins imported from packages, remember to call the imported plugin function (i.e. `commonjs()`, not just `commonjs`). Falsy plugins will be ignored, which can be used to easily activate or deactivate plugins. Nested plugins will be flatten. Async plugins will be awaited and resolved.
+See [Using plugins](../tutorial/index.md#using-plugins) for more information on how to use plugins and [Plugins](../plugin-development/index.md) on how to write your own (try it out, it's not as difficult as it may sound and very much extends what you can do with Rollup). For plugins imported from packages, remember to call the imported plugin function (i.e. `commonjs()`, not just `commonjs`). Falsy plugins will be ignored, which can be used to easily activate or deactivate plugins. Nested plugins will be flattened. Async plugins will be awaited and resolved.
 
 ```js
 // rollup.config.js