[Bug]: Recover doc lost when merging auto-generation

[chaen]

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Bug Description

#698 is super nice, but in the way we have lost some documentation (OTEL variables and all). We should just recover it all

Steps to Reproduce

For example

`DIRACX_OTEL_HEADERS`: A JSON-encoded dictionary of headers to pass to the OpenTelemetry collector.

became

### `DIRACX_OTEL_HEADERS`

*Optional*, default value: `None`

Expected Behavior

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Actual Behavior

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Environment

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Relevant Log Output

Additional Context

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