Correct some errors in documentation for iamge generators

deepcell/image_generators.py

@@ -612,7 +612,8 @@ class ImageFullyConvDataGenerator(ImageDataGenerator):
 
             - float: fraction of total width, if < 1, or pixels if >= 1.
             - 1-D array-like: random elements from the array.
-            - int: integer number of pixels from interval `(-width_shift_range, +width_shift_range)`
+            - int: integer number of pixels from interval
+              `(-width_shift_range, +width_shift_range)`
             - With `width_shift_range=2` possible values are ints [-1, 0, +1], same as with
               `width_shift_range=[-1, 0, +1]`, while with `width_shift_range=1.0` possible values
               are floats in the interval [-1.0, +1.0).