Increase the default values for constructor and slice in buffer
Signed-off-by: Nhwx1163501 <hanjing35@huawei.com> issue:https://gitee.com/openharmony/docs/issues/I70CZE
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Signed-off-by: Nhwx1163501 <hanjing35@huawei.com> issue:https://gitee.com/openharmony/docs/issues/I70CZE