Enable Ruff d200 rule

[MarcSkovMadsen]

Continues from #982. So review that one first.

I've re-renabled rule D200 in pyproject.toml and applied ruff check --unsafe-fixes.

Then checked the changes manually.

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.

Project coverage is 87.36%. Comparing base (1868240) to head (f2791e6).

Files with missing lines	Patch %	Lines
param/serializer.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #983   +/-   ##
=======================================
  Coverage   87.35%   87.36%           
=======================================
  Files           9        9           
  Lines        4935     4938    +3     
=======================================
+ Hits         4311     4314    +3     
  Misses        624      624           

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[maximlt]

@MarcSkovMadsen in case it wasn't clear, I did not suggest to open one PR per rule:

I'm not necessarily saying one rule at a time. It's just I'd like to avoid having to review all the docstrings of the complete API at once, as it's a lot, and I'm quite sure there are a few traps along the way that could slow you down or even block you entirely if done in one PR, while if you iterate we can be much more efficient and release improvements quickly.

I think it's totally fine if you open one PR that enables multiple rules at the same time, specially if it's only about formatting. Things will get more challenging for reviewers as soon as you'll touch the real meat which is the content of the docstrings.

cc @hoxbro