fix: a typo in docs/configuration.md (#4029)

Author: kkweon

docs/configuration.md

@@ -113,7 +113,7 @@ E.g., it still does not work, or you want to fine-tune the configuration.
 In that case, refer to the [hie-bios explicit configuration documentation](https://github.com/haskell/hie-bios#explicit-configuration).
 Keep in mind that you can start from the `hie.yaml` file generated by `implicit-hie` (see previous section) and modify it to your liking.
 
-#### Examples of explicit `hie-yaml` configurations
+#### Examples of explicit `hie.yaml` configurations
 
 ##### Basic Stack
 ```yaml