Merge branch 'fix_doc' into 'NIFTy_5'

Fix doc

See merge request !371
11 jobs for NIFTy_5 in 22 minutes and 49 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Build Docker
passed build_docker_from_scratch #969697

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  Test
passed test_mpi #969699

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passed test_serial #969698

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82.0%
 
  Release
passed pages #969700

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  Demo Runs
passed run_bernoulli #969705

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passed run_curve_fitting #969706

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passed run_getting_started_1 #969702

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passed run_getting_started_2 #969703

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passed run_getting_started_3 #969704

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passed run_ipynb #969701

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  Deploy
passed pages:deploy

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