Finish writing docstrings that have "TODO" #146
Description
For example, functions in https://github.com/LAMPSPUC/ScoreDrivenModels.jl/blob/master/src/initial_params.jl
{{ message }}
For example, functions in https://github.com/LAMPSPUC/ScoreDrivenModels.jl/blob/master/src/initial_params.jl