update TOC nesting to reflect structure

Author: geemus

README.md

@@ -33,9 +33,9 @@ We welcome [contributions](CONTRIBUTING.md) to this guide.
   *  [Provide full resources where available](#provide-full-resources-where-available)
   *  [Accept serialized JSON in request bodies](#accept-serialized-json-in-request-bodies)
   *  [Use consistent path formats](#use-consistent-path-formats)
-  *  [Downcase paths and attributes](#downcase-paths-and-attributes)
-  *  [Support non-id dereferencing for convenience](#support-non-id-dereferencing-for-convenience)
-  *  [Minimize path nesting](#minimize-path-nesting)
+    *  [Downcase paths and attributes](#downcase-paths-and-attributes)
+    *  [Support non-id dereferencing for convenience](#support-non-id-dereferencing-for-convenience)
+    *  [Minimize path nesting](#minimize-path-nesting)
 * [Responses](#responses)
   *  [Provide resource (UU)IDs](#provide-resource-uuids)
   *  [Provide standard timestamps](#provide-standard-timestamps)