fix: fix parameters not showing in doc bug

[yuejiaointel]

Description

Hi to whom is reviewing this PR!
This PR fixed a bug in documentation generation where the Parameters section under all classes are missing. The root problem was because the template in wrapper_gen.py was putting cdef tuple _params above the parameters doc strings. As a result, sphinx cannot extract the docstring out and parameters under all classes are missing. The fix was a simple one line change that put docstring on top. The doc pipeline in this branch does not work, fixed in another PR that has not been merged yet. To see the effect, either get the branch or try out the one line change.
Best,
Yue

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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[icfaust]

/azp run Docs

[azure-pipelines]

Azure Pipelines could not run because the pipeline triggers exclude this branch/path.

[icfaust]

Was hoping I could get the docs to run on this, but it seems that azure pipelines is being uncooperative.