fix backport

Author: kay-kim

source/reference/sql-aggregation-comparison.txt

@@ -65,9 +65,9 @@ terms, functions, and concepts and the corresponding MongoDB
 
    * - join
 
-     - :pipeline:`$lookup`
-       
-       .. versionadded:: 3.2
+     - No direct corresponding operator; however, the
+       :pipeline:`$unwind` operator allows for somewhat similar
+       functionality, but with fields embedded within the document.
 
 
 .. seealso:: :doc:`/reference/sql-comparison`