fixed 8b984cef from https://gitee.com/zhangbingce/docs/pulls/18524
[canvas]canvasrenderingcontext2d和offscreencanvasrenderingcontext2d构造中RenderingContextSettings非必填
Signed-off-by: Nzhangbingce <zhangbingce@huawei.com>
Change-Id: I2c73ac518c4d2a9e7e7cc92d5e2a8d5c013f43e1
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