Merge pull request #270 from VectorInstitute/update-lr-scheduler-docu…

…mentation

Address Shawns CR on previous PR

fl4health/utils/nnunet_utils.py

@@ -430,8 +430,10 @@ def __init__(
             initial_lr (float): The initial learning rate of the optimizer.
             max_steps (int): The maximum total number of steps across all FL rounds.
             exponent (float): Controls how quickly LR descreases over time. Higher values
-                lead to more rapdid descent.
+                lead to more rapdid descent. Defaults to 0.9.
             steps_per_lr (int): The number of steps per LR before decaying.
+                (ie 10 means the LR will be constant for 10 steps prior to being decreased to the subsequent value).
+                Defaults to 250 as that is the default for nnunet (decay LR once an epoch and epoch is 250 steps).
         """
         self.optimizer = optimizer
         self.initial_lr = initial_lr