message: Improved the docs for tensorflow.keras.callbacks.ModelCheckpoint's filepath argument
diff: @@ -804,6 +804,8 @@ class ModelCheckpoint(Callback):
  verbose: verbosity mode, 0 or 1.
  save_best_only: if `save_best_only=True`, the latest best model according
  to the quantity monitored will not be overwritten.
  + If `filepath` doesn't contain formatting options like `{epoch}` then
  + `filepath` will be overwritten by each new better model.
  mode: one of {auto, min, max}. If `save_best_only=True`, the decision to
  overwrite the current save file is made based on either the maximization
  or the minimization of the monitored quantity. For `val_acc`, this
  