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

Nobody has claimed this yet.

### 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.

Start with the pyplot.draw documentation at the linked page, then locate and read the documentation for fig.canvas.draw_idle to understand the claimed equivalence. Clarify the synchronous or deferred behavior in the draw description and add a link to draw_idle; the documentation should explain the distinction without ambiguity.

Written by the indexing model from the issue text.