Fix missing object to read from for listen example

Editor assessment

The subject is a tangled clause (fix missing object to read from for listen example) that decodes as the listen example referencing an object that no longer exists, but only after several readings. Type docs content under a fix type is defensible for an example error, though no scope token anchors the documentation. No body restates the problem cleanly, and no footers appear. The intended lesson is recoverable, but the phrasing makes the reader work too hard for it.