Filipe charge docs

[FilipeFcp]

Hi all,
There are some missing classes in the docs, so I am trying to add them.
Please @daquinteroflex , let me know if this is the correct way.
Also, @marc-flex, let me know if there is a reason for these classes not to be in the docs. Also, if you have something in mind to add, let me know.

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Greptile Summary

Documentation updates for previously undocumented charge-related classes in Tidy3D, focusing on boundary conditions and mobility models.

• Fixed mathematical notation in tidy3d/components/tcad/boundary/charge.py, replacing incorrect '\dot' with proper '\cdot' in InsulatingBC documentation
• Added documentation for ConstantMobilityModel, DCCurrentSource, InsulatingBC, and ParameterPerturbation classes
• Documentation includes mathematical equations, usage examples, and field descriptions for charge/heat simulation boundary conditions
• Documentation improvements in FAQ section related to voltage and current boundary conditions
• Note: TODO comment regarding current source units needs to be addressed

[greptile-apps]

LGTM

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[marc-flex]

Thanks a lot @FilipeFcp for bringing this up. If the classes aren't in the docs it isn't by design but by omission. So do let us know if you find anything else missing.

In general, we can add classes to the docs by incorporating them somewhere under here: https://github.com/flexcompute/tidy3d/tree/develop/docs/api

I'll create an additional PR to add them

[daquinteroflex]

Thanks a lot @FilipeFcp ! Sorry just saw now, yes changing the rst like in the other PR is how it fixes the class addition. The math notation looks good thanks for that.