`sample()`

has many methods. One has `nchains`

and another has `n_chains`

. What is the difference between these parameters?

```
nchains: sample(model::AbstractMCMC.AbstractModel, sampler::AbstractMCMC.AbstractSampler, parallel::AbstractMCMC.AbstractMCMCParallel, N::Integer, nchains::Integer; kwargs...) in AbstractMCMC
n_chains: sample(rng::AbstractRNG, model::AbstractMCMC.AbstractModel, sampler::DynamicPPL.Sampler{var"#s60",S} where S<:DynamicPPL.AbstractSamplerState where var"#s60"<:Turing.Inference.InferenceAlgorithm, parallel::AbstractMCMC.AbstractMCMCParallel, N::Integer, n_chains::Integer; chain_type, progress, kwargs...) in Turing.Inference
```