Cubic constructor's documentation is wrong in curves.dart #103554
Description
The Cubic's doc says:
/// The [a] (x1), [b](x2), [c](y1), and [d](y2) arguments must not be null.However, the correct is: a (x1), b (y1), c (x2) and d (y2), as it says below in each variable description.
Moreover, b, cand d are being considered as an hiperlink by the VSCode and probably other IDE's, as no space between [] and () is provided. Here a screenshot of this issue in the VSCode:
