docs: fix broken image path in contribute-docs.md

[princexpoddar]

Page URL: https://project-hami.io/docs/contributor/contribute-docs

What is wrong: In docs/contributor/contribute-docs.md (line 152) and i18n/zh/docusaurus-plugin-content-docs/current/contributor/contribute-docs.md (line 152)..the documentation uses /img/docs/common/architecture/hami-arch.png in the image reference.

but the directory /img/docs/common/architecture/ does not exist under static/...Attempting to resolve this image path results in a 404 error.

The actual architecture diagram image is there at static/img/docs/common/developers/hami-core-design/hami-arch.png

What it should say instead: Update the image reference in both English and Chinese docs (as well as versioned_docs/version-v2.9.0) to point to the valid image path

[coderabbitai]

🔗 Related PRs

#524 - fix: mirror hotlinked blog image into static assets [merged]
#537 - fix: use relative link for case studies page in blog post [merged]
#552 - docs: add missing subsection headings to zh architecture page [merged]
#562 - fix(site): restore generated-site link checks [merged]
#566 - Update device sharing legend [merged]

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