shell: Take docs from the correct manifest item

Fixes cockpit-project#21040

pkg/shell/topnav.jsx

@@ -92,7 +92,7 @@ export class TopNav extends React.Component {
         const {
             current_location,
             current_machine,
-            current_machine_manifest_items,
+            current_manifest_item,
             current_frame,
         } = this.props.state;
 
@@ -113,16 +113,14 @@ export class TopNav extends React.Component {
             }
         }
 
-        const item = current_machine_manifest_items.items[current_location.path];
-        if (item && item.docs)
-            docs = item.docs;
+        // Check first whether we have docs in the "parent" section of
+        // the manifest.
+        const comp = cockpit.manifests[current_location.path];
+        if (comp && comp.parent && comp.parent.docs)
+            docs = comp.parent.docs;
+        else if (current_manifest_item.docs)
+            docs = current_manifest_item.docs;
 
-        // Check for parent as well
-        if (docs.length === 0) {
-            const comp = cockpit.manifests[current_location.path];
-            if (comp && comp.parent && comp.parent.docs)
-                docs = comp.parent.docs;
-        }
         const docItems = [];
 
         if (this.state.osRelease.DOCUMENTATION_URL)