Update ibm_db2.stub.php

Author: phansys

ibm_db2.stub.php

@@ -27,7 +27,7 @@ function db2_pconnect(string $database, ?string $username, ?string $password, ar
 /**
  * @param resource $connection
  */
-function db2_autocommit($connection, ?int $value = null): int|bool {}
+function db2_autocommit($connection, int $value = null): int|bool {}
 
 /**
  * @param resource $connection
@@ -121,7 +121,7 @@ function db2_special_columns($connection, ?string $qualifier, string $schema, st
  * @return resource
  * @alias db2_special_columns
  */
-function db2_specialcolumns(resource $connection, ?string $qualifier, string $schema, string $table_name, int $scope) {}
+function db2_specialcolumns($connection, ?string $qualifier, string $schema, string $table_name, int $scope) {}
 
 /**
  * @param resource $connection