fix: item numbering in document

[glypt]

The PR docling-project/docling#2589 revealed a bug, the caption is having the same number as the table here in https://github.com/docling-project/docling/pull/2589/files#diff-0ff184cc09560c89eb50dc9cf939c40bdf55d372d26823c956b55fb8f6c5e16fR1-R5.

This introduces a global numbering with increment at each item.

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