Update documentation for CJ supporting complex number

[sandhya-davera]

In the documentation, pg no. 73, it says the function CJ "support for sorting complex is not yet implemented".
I expected to get a warning, but the sorting looks correct. It looks like it has been added in the pull request #3690. If the functionality is implemented, would it be possible to update the documentation to remove this comment: "support for sorting complex is not yet implemented"

[ben-schwen]

Good catch, ty for the report. Seems that #3691 added the current example and it wasn't updated when we started to support sorting complex with #3701

[MichaelChirico]

thanks @sandhya-davera ! do you want to have a go at writing the PR?