undo builder_level change

docs/defaults/guide.md

@@ -55,7 +55,7 @@ libraries:
     overlay_path:
       - pmm: ratings
         template_variables:
-          builder_level: episode
+          overlay_level: episode
 ```
 
 Each file has a page on the wiki showing the available `template_variables` for each file. For example the default `pmm: ratings` has a page [here](overlays/ratings).
@@ -63,4 +63,4 @@ Each file has a page on the wiki showing the available `template_variables` for
 **In addition to the defined `template_variables` almost all default Metadata and Overlay files have access to their respective [Metadata](collection_variables)/[Overlay](overlay_variables.md) Shared Variables.**
 
 ```{include} example.md
-```
+```