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

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Author: pre-commit-ci[bot]

docs/notebooks/tutorial/tutorial.parallelism.md

@@ -70,7 +70,6 @@ from mpi4py.futures import MPIPoolExecutor
 # use the idiom below, see the warning at
 # https://mpi4py.readthedocs.io/en/stable/mpi4py.futures.html#mpipoolexecutor
 if __name__ == "__main__":
-
     learner = adaptive.Learner1D(f, bounds=(-1, 1))
 
     # load the data