Issue on docs window-function

[ConradWen]

Path:/zh-CN/docs/sql-manual/sql-functions/window-functions/window-function

create table stock_ticker (stock_symbol string, closing_price decimal(8,2), closing_date timestamp);
...load some data...
select * from stock_ticker order by stock_symbol, closing_date

In the table building statement" closing_date timestamp",doris' data type does not support timestamp. May mislead users.