API token playload is not explained in documentation

Problem to solve

Standard user doesn't have easily access to the definition of the API token playload.

Further details

Token playload is described in the OpenAPI documentation : https://gitlab.com/prod-manager/prod-manager/-/blob/master/ProdManager/static/meta/openapi.yaml?plain=1#L44

Proposal

Add a section in the API Token documentation describing each fields : https://gitlab.com/prod-manager/prod-manager/-/blob/master/docs/api/token.md#get-token-metadata

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