Fix another comment typo. No code changes.

FossilOrigin-Name: 3203256c0285ef2fea810d59978603bfd7e38151cbc42e1baddf84b57c56f638

src/select.c

@@ -6746,7 +6746,7 @@ static void finalizeAggFunctions(Parse *pParse, AggInfo *pAggInfo){
 ** For an ORDER BY aggregate, the actual accumulator memory cell update
 ** is deferred until after all input rows have been received, so that they
 ** can be run in the requested order.  In that case, instead of invoking
-** OP_AggStep to update accumulator, just add the arguments that would
+** OP_AggStep to update the accumulator, just add the arguments that would
 ** have been passed into OP_AggStep into the sorting ephemeral table
 ** (along with the appropriate sort key).
 */