[BUG] simplicial_set_embedding does not support array as init pos

[Intron7]

simplicial_set_embedding states in it's docstring that it support numpy arrays as the intial positions for the embedding. However that doesn't work.

Steps/Code to reproduce bug

    init: string
        How to initialize the low dimensional embedding. Options are:
            * 'spectral': use a spectral embedding of the fuzzy 1-skeleton
            * 'random': assign initial embedding positions at random.
            * A numpy array of initial embedding positions.

    if init not in ['spectral', 'random']:
        raise Exception("Initialization strategy not supported: %d" % init)

Expected behavior
Either remove the part of the docstring or better enable this.

[divyegala]

Closed by #6043