docs: fix broken link to plugins (#16520)

Author: adamtnagy

docs/src/user-guide/core-concepts.md

@@ -44,7 +44,7 @@ An ESLint plugin is an npm module that can contain a set of ESLint rules, config
 
 A popular use case for plugins is to enforce best practices for a framework. For example, [@angular-eslint/eslint-plugin](https://www.npmjs.com/package/@angular-eslint/eslint-plugin) contains best practices for using the Angular framework.
 
-For more information, refer to [Configuring Plugins](./configuring/plugins.md).
+For more information, refer to [Configuring Plugins](./configuring/plugins).
 
 ## Parsers