Fixed build doc

8 jobs for Fix-doc in 8 minutes and 41 seconds (queued for 2 seconds)
Name Stage Failure
tests-and-coverage Test
FAILED pystencils_tests/test_small_block_benchmark.ipynb::test_small_block_benchmark.ipynb
= 9 failed, 417 passed, 8 xfailed, 6 xpassed, 52 warnings in 160.35s (0:02:40) =
Uploading artifacts for failed job
Uploading artifacts...
coverage_report: found 78 matching files and directories

test-report: found 4 matching files and directories

Uploading artifacts as "archive" to coordinator... ok
id=504489 responseStatus=201 Created token=TtWx1jDb
Cleaning up file based variables
ERROR: Job failed: exit code 1