The chooser's marks are × at the left, tappable once marked

From the development repository at 5252a58.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

docs/guest.md

@@ -304,7 +304,7 @@ right of your toolbar:
   your notebooks, with everything that was written on it.  A chooser
   shows your notebooks and small pictures of their kept pages.  The kept
   page itself is not changed: the session works on a copy.  The same
-  chooser deletes pages and notebooks of yours, marked with the dot at
+  chooser deletes pages and notebooks of yours, marked with the × at
   their left and then the **Delete** button, pressed twice; the host's part says
   more.
 * **Hide**, among the tools, hides part of the page for everyone: drag