[Docs] Add documentation for what functions are invoked within the model.train method

[cosmicBboy]

Similar to the model.predict method, document the functions that are invoked inside the model.train method.

[ManishS6]

#self-assign

[ManishS6]

@cosmicBboy Please guide me where exactly is the page located in the repository. The Edit button on the webpage showing 404.

[akhildevelops]

Hi @cosmicBboy there is doc string for model.train method and also for all the internal invoked functions

[bilal-aamer]

#self-assign

[bilal-aamer]

#take