Fix various admin doc

[fso42]

• change zenodo cite
• add docstring info

https://docs.avaframe.org/en/fixvariousadmindoc/

[codeclimate[bot]]

Code Climate has analyzed commit 485ec1ca and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 70.1% (0.0% change).

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