14_callback.schedule: create docments

[muellerzr]

Add docments to 14_callback.schedule

See the style guide and contribution guidefor more details

This requires a large amount of PyTorch and fastai knowledge to get through, as 99% of it relates to schedulers in a training loop and the LRFinder

Docments progress:

• [ ] Annealing
• [ ] ParamScheduler
• [ ] LRFind
• [ ] Suggestion Methods