Fix mkdocs ToC

Author: mpilgrem

mkdocs.yml

@@ -98,7 +98,8 @@ nav:
   - topics/index.md
   - Stack root: topics/stack_root.md
   - Stack work directories: topics/stack_work.md
-  - Snapshot and package location: topics/pantry.md
+  - Snapshot location: topics/snapshot_location.md
+  - Package location: topics/package_location.md
   - Snapshot specification: topics/custom_snapshot.md
   - stack.yaml vs a Cabal file: topics/stack_yaml_vs_cabal_package_file.md
   - Script interpreter: topics/scripts.md