Bug: Invalid-looking comparison in reading_order_rb.py

[stestagg]

This line:

docling-ibm-models/docling_ibm_models/reading_order/reading_order_rb.py

Line 199 in 55d59aa

elem.page_no != sorted_elements[ind_p1].label

Looks wrong to me, comparing page_no with a label:
elem.page_no != sorted_elements[ind_p1].label

I assume it's meant to read:
elem.page_no != sorted_elements[ind_p1].page_no
but it's hard to be sure as it's part of a multi-line if.

Apologies if this is actually doing something super subtle that I missed!