Fixes 404 with "Custom Resources" chapter

Author: weierophinney

mkdocs.yml

@@ -7,7 +7,7 @@ pages:
       - "HAL": hal.md
       - "Links and Resources": links-and-resources.md
       - "Generating Resources": resource-generator.md
-      - "Custom Resources": generating-custom-resources.md
+      - "Custom Resources": cookbook/generating-custom-resources.md
       - "Representations": representations.md
       - "Factories": factories.md
     - Cookbook: