`PhrictionDocumentTitleTransaction` calls `$this->renderHandleLink()`.
`PhabricatorApplicationTransaction` defines that method `public function renderHandleLink($phid)`.
PhrictionDocumentTitleTransaction extends PhrictionDocumentVersionTransaction extends PhrictionDocumentTransactionType extends PhabricatorModularTransactionType extends Phobject. No PhabricatorApplicationTransaction in that ancestor tree. Thus this call will fail.
Thus replace `renderHandleLink()` with `renderObject()` as used in other `getTitle()` or `getTitleForFeed()` implementations.