Editorial review: Document WebGPU compatibility mode

[chrisdavidmills]

Description

Chrome 146 adds support for WebGPU compatibility mode; see https://chromestatus.com/feature/6436406437871616, and also see https://developer.chrome.com/blog/new-in-webgpu-146#support_webgpu_compatibility_mode_on_opengl_es_31 for more info and context.

This PR:

• Documents the featureLevel option of the GPU.requestAdapter() method, which is used to opt in to compatibility mode.
• Updates the description of the core-features-and-limits feature on the GPUSupportedFeatures so that it makes more sense now compatibility mode is supported.
• Adds a small section on compatibility mode to the WebGPU landing page, as it seems like quite an important concept to draw attention to.

cc @beaufortfrancois

Motivation

Additional details

Related issues and pull requests

[github-actions]

Preview URLs (3 pages)

• /en-US/docs/Web/API/GPU/requestAdapter
• /en-US/docs/Web/API/GPUSupportedFeatures
• /en-US/docs/Web/API/WebGPU_API

External URLs (1)

URL: /en-US/docs/Web/API/WebGPU_API
Title: WebGPU API

• https://webgpufundamentals.org/webgpu/lessons/webgpu-compatibility-mode.html (1 time) (Note! This may be a new URL 👀)

[beaufortfrancois]

LGTM