[Janani-bn]

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• This PR references an issue (except for typos, broken links, or other minor problems)

Description(required)

Adds a reference page for createRenderer under Reference > Rendering, closing the gap in #1222: the function is exported from solid-js/universal but has no documentation.

The page covers:

• what a custom renderer is and when you would build one (native UI, canvas, terminal)
• the compiler setup universal output needs (generate: "universal" and moduleName in babel-preset-solid)
• the full RendererOptions interface with a per-option table
• the returned Renderer object's runtime helpers (render, effect, memo, createComponent, insert, spread, setProp, mergeProps, use)
• a complete DOM-backed example renderer that shows the build-a-renderer flow end to end, plus the control-flow re-exports a universal package needs

Content is grounded in the published solid-js@1.9.17 types (solid-js/universal).

Checks run on this branch against current main: pnpm build (page renders at /reference/rendering/create-renderer), pnpm check:types, pnpm check:lint, and prettier --check all pass.

Related issues & labels

• Closes Add documentation for createRenderer and universal rendering #1222
• Suggested label(s) (optional): documentation

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