Update sparse crate docs#1557

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SeabertYuan wants to merge 2 commits intodimforge:mainfrom

SeabertYuan:sparse-docs

Commits on Oct 9, 2025

docs: link conversions page from CooMatrix page and add reference to duplicate entry sum behaviour
Seabert Yuan
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Commits on Oct 10, 2025

docs: update version in sparse crate home page usage section
Seabert Yuan
committed