Renderer: Fix return type in compileAsync method documentation

[querielo]

No description provided.

[github-actions]

📦 Bundle size

Full ESM build, minified and gzipped.

	Before	After	Diff
WebGL	356.24 86.47	356.24 86.47	+0 B +0 B
WebGPU	610.57 171.28	610.57 171.28	+0 B +0 B
WebGPU Nodes	609.18 171.02	609.18 171.02	+0 B +0 B

🌳 Bundle size after tree-shaking

Minimal build including a renderer, camera, empty scene, and dependencies.

	Before	After	Diff
WebGL	487.87 121.22	487.87 121.22	+0 B +0 B
WebGPU	679.35 186.51	679.35 186.51	+0 B +0 B
WebGPU Nodes	621.07 169.69	621.07 169.69	+0 B +0 B

[Copilot]

Pull Request Overview

This PR corrects the JSDoc return type annotation for the compileAsync method to accurately reflect its implementation.

• Updated the return type documentation from Promise<Array|undefined> to Promise<void> to match the actual behavior

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