Show new initialization in docs

[esheldon]

The init in the docs doesn't work well for me in LSST data. but the code used for the Task works ok, e.g.

    blend.parameterize(                                                                                                               
        partial(                                                                                                                      
            scl.component.default_adaprox_parameterization,                                                                           
            noise_rms=obs.noise_rms / 10,                                                                                             
        )                                                                                                                             
    )