fix: Correct description of render pipeline

Code to reflect this correction has not yet been written.

site/guide/pipeline.vox

@@ -22,8 +22,9 @@ When changes are made, rebuilding can be done selectively:
     - A page is considered added if its path appears in the new DAG, but not the old one.
     - A page is considered removed if its path appears in the old DAG, but not the new one.
 3. A list of pages needing rendering is computed.
-    - All pages that were modified need to be re-rendered.
+    - All pages that were modified need to be rendered.
         - Their descendants in the new DAG also need to be rendered.
+        - If the page is a layout, its parents in the new DAG need to be rendered.
     - All pages that were added need to be rendered.
         - Their descendants in the new DAG also need to be rendered.
     - All pages that were removed need their descendants in the new DAG rendered.