Markdown header levels are all the same

[jiaboli007]

Bug

This is probably not a real bug but a feature request:

All headers in the generated markdown files are at the same level, i.e. ##

.

For example, in the sample PDF to markdown conversion, section 3 has multiple sub-sections:

3 Processing pipeline

....

3.1 PDF backends

...

3.2 AI models

The correct header levels really should be something like this:

3 Processing pipeline

....

3.1 PDF backends

...

3.2 AI models

...

It would be great if the header level can be fixed, because this can keep the hierarchical structure of the original article.

Steps to reproduce

Just run the sample code of this repo.
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Docling version

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Python version

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