Merge branch 'fix_docstring_warnings' into 'NIFTy_6'

Fix docstring warnings

See merge request !475
11 jobs for NIFTy_6 in 8 minutes and 23 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build Docker
passed #1081629
build_docker_from_cache

00:00:17

 
  Test
passed #1081631
test_mpi

00:00:34

passed #1081630
test_serial

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85.0%
 
  Demo Runs
passed #1081637
run_bernoulli

00:00:30

passed #1081638
run_curve_fitting

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passed #1081633
run_getting_started_1

00:00:33

passed #1081634
run_getting_started_2

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passed #1081635
run_getting_started_3

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passed #1081636
run_getting_started_mf

00:05:05

passed #1081632
run_ipynb

00:01:28

failed #1081639
run_visual_mgvi

00:00:30

 
Name Stage Failure
failed
run_visual_mgvi Demo Runs
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