[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

data_structures/arrays/monotonic_array.py

@@ -33,4 +33,5 @@ def is_monotonic(nums: list[int]) -> bool:
     print(is_monotonic([1, 3, 2]))  # Output: False
 
     import doctest
+
     doctest.testmod()