Address doctests D103

[insspb]

Closes #1269
Closes #742

Feel free to check my english, while it is in wip.

[ssbarnea]

I think that you want to remove D103 exclude from setup.cfg with this change.

[insspb]

I think that you want to remove D103 exclude from setup.cfg with this change.

Want, but when will fixx all 100+ issues.
Converted to draft.

[ssbarnea]

Most of the changes added are good but there are issues that would prevent it from passing review:

• that is a jumbo size review, I stopeed the review when I was only ~20% of it.
• this change combines multiple changes unrelated to docstrings

Now is time to split it in several smaller ones that can easily be reviewed and merged. Please try to cherry pick similar changes counting up to ~100 lines per pull-request.

I will prioritize review of any such change so we can finish delivering this task.

Probably is better to not create all PRs in parallel because likely they will require more rebase work, i suspect serial would be easier for both in this case (once one merged, create a new one).

[insspb]

This PR is splited to:

#1369
#1370
#1371
#1372
#1373
#1374
#1375
#1376
#1377
#1378
#1379
#1380

[insspb]

Please do not touch branch, until other merged.