fix Rather that/Rather than; thanks to Reuben Thomas from docs@

Doc/reference/simple_stmts.rst

@@ -372,7 +372,7 @@ The :keyword:`del` statement
    del_stmt: "del" `target_list`
 
 Deletion is recursively defined very similar to the way assignment is defined.
-Rather that spelling it out in full details, here are some hints.
+Rather than spelling it out in full details, here are some hints.
 
 Deletion of a target list recursively deletes each target, from left to right.