fix(pptx)!: assign pptx notes to ContentLayer.NOTES

[Vdaleke]

Assign pptx notes to ContentLayer.NOTES instead of ContentLayer.FURNITURE.

Resolves #3340

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

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Documentation Updates

1 document(s) were updated by changes in this PR:

What are the detailed pipeline options and processing behaviors for PDF, DOCX, PPTX, and XLSX files in the Python SDK?

View Changes

@@ -121,7 +121,7 @@
     - `PaginatedPipelineOptions` (image scaling, page image generation)
 - **Processing**:
     - Each slide is treated as a page
-    - Extracts text (paragraphs, lists, indentation, master styles), images (using PIL), tables (cell/span/header), slide notes (furniture)
+    - Extracts text (paragraphs, lists, indentation, master styles), images (using PIL), tables (cell/span/header), slide notes (notes)
     - Tables and images include provenance (location info)
 - **Notes**: Image resolution adjustment is not supported (depends on backend quality). [Pipeline code reference](https://github.com/docling-project/docling/blob/ae4fdbbb09fd377bb271e9b2efe541873eeb2990/docling/document_converter.py#L100-L506).
 

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