build: the way down the tree is the link at the foot

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GT37Z1Xtfd9pUuQtMTg6Yt

src/build.rs

@@ -1643,10 +1643,10 @@ pub fn render(plan: &Plan, words: &BTreeMap<String, Value>) -> anyhow::Result<BT
     }
 
     for need in &plan.needs {
-        // No "back" alternative: portal's way down the tree (the arrow at
-        // the left and the link at the foot) takes a visitor
-        // one level down from any page, here to the front door or, after
-        // an internal form, to the group's desk.
+        // No "back" alternative: portal's way down the tree (the link at
+        // the foot of every page) takes a visitor one level down from
+        // any page, here to the front door or, after an internal form,
+        // to the group's desk.
         let path = match &need.enters_as {
             None => format!("questions/received/{}.yaml", need.id),
             Some(group) => format!("questions/{group}/{}-sent.yaml", need.id),