ScalarPotential Help Documentation out of date

[Craftyleosteel]

Describe the bug Inaccurate description of ScalarPotential in the documentation. Now, ScalarPotential can be initialized without gradient and can be done only with a function. ScalarPotential then numerically calculates the gradient (check #84). However, the help says it requires two functions

[softmattertheory]

Thanks for this feedback, @Craftyleosteel; I'll update the documentation.

[softmattertheory]

I've now updated the documentation and the correct specification for ScalarPotential is fixed by #232 and will be available in 0.5.7. Thanks again @Craftyleosteel