Fix height docstr copypasta

[ryan-williams]

Updated docstr to match _renderers.py#L388-L394:

plotly.py/plotly/io/_renderers.py

Lines 388 to 394 in ae85438

	width: int or float
	An integer or float that determines the number of pixels wide the
	plot is. The default is set in plotly.js.
	height: int or float
	An integer or float specifying the height of the plot in pixels.
	The default is set in plotly.js.

[LiamConnors]

Thanks for the PR @ryan-williams