Update docs/hub/dduf.md

Co-authored-by: Julien Chaumond <[email protected]>

Author: Wauplin

docs/hub/dduf.md

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 # DDUF
 
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 ## Overview
 
 DDUF (**D**DUF’s **D**iffusion **U**nified **F**ormat) is a file format designed to make storing, distributing, and using diffusion models much easier. Built on the ZIP file format, DDUF offers a standardized, efficient, and flexible way to package all parts of a diffusion model into a single, easy-to-manage file.