[Doc]: difference between pyplot.draw and fig.canvas.draw_idle

還沒有人認領這個 Issue。

### Documentation Link

https://matplotlib.org/stable/api/_as_gen/matplotlib.pyplot.draw.html

### Problem

> This is equivalent to calling `fig.canvas.draw_idle()`, where `fig` is the current figure.

To me, `draw` sounds a synchronous behavior, whereas `draw_idle` sounds like an asynchronous behavior. I think this statement of equivalence is confusing, because it claims what sounds to me like two different behaviors, are actually the same.

Can we elaborate on the equivalence, perhaps making it more clear what `draw_idle` means?

Also, on that page, can we link to the docs for `draw_idle` (if there are docs on it)?

### Suggested improvement

I am not familiar with `matplotlib` enough to make a quality suggestion here.

先從連結頁面上的 pyplot.draw 文件開始，接著找到並閱讀 fig.canvas.draw_idle 的文件，以了解所聲稱的等價性。在 draw 的描述中釐清同步或延遲行為，並新增指向 draw_idle 的連結；文件應毫無歧義地說明其中的差異。

由索引模型根據 Issue 內容生成。