add comment do pdo_bigint_outparam.phpt and sqlsrv_bitint_outparam.phpt

test/functional/pdo_sqlsrv/pdo_bigint_outparam.phpt

@@ -42,7 +42,7 @@ printf("\n");
 
 $conn->exec("TRUNCATE TABLE $tbname");
 
-// Insert a small bigint
+// Insert a random small value truncated from the bigint input
 insertRow($conn, $tbname, array("c1_bigint" => 922337203));
 
 // Call stored procedure with output

test/functional/sqlsrv/sqlsrv_bigint_outparam.phpt

@@ -40,7 +40,7 @@ var_dump($bigintOut);
 printf("\n");
 sqlsrv_query($conn, "TRUNCATE TABLE $tbname");
 
-// Insert a small bigint
+// Insert a random small value truncated from the bigint input
 AE\insertRow($conn, $tbname, array("c1_bigint" => 922337203));
 
 // Call stored procedure with SQLSRV_PARAM_OUT