fix: Reformat docstrings for black

To pass tox tests.
This seems to have changed in black from version 20.8b1 to 21.4b2.
11 jobs for m12_black_docstring in 39 minutes and 2 seconds (queued for 2 seconds)
latest
Status Name Job ID Coverage
  Test
passed python310 #19406

00:12:57

passed python36 #19399

00:12:52

passed python37tor035 #19400

00:12:12

passed python37tor045 #19417

00:12:12

passed python37tormaster #19402

00:12:46

passed python37torstable #19403

00:12:23

passed python38 #19404

00:06:33

passed python39 #19405

00:12:20

failed python37tor045 #19401

00:12:04

 
  Deploy
passed pages #19407

00:01:00

passed pages:deploy

00:00:00