Add information on unrestricted_pointer_parameters extension

[chrisdavidmills]

Description

Chrome 123 supports the unrestricted_pointer_parameters language extension (see WGSLLanguageFeatures), which loosens restrictions on pointers being passed to WGSL functions as follows:

• Parameter pointers to storage, uniform, and workgroup address spaces being passed to user-declared functions.
• Pointers to structure members and array elements being passed to user-declared functions.

This PR adds an entry to the "Available features" table on the WGSLLanguageFeatures ref page for this feature. I'm copying the same structure as I used in #36880, and will deal with merging them as they start to get published.

See https://developer.chrome.com/blog/new-in-webgpu-123#unrestricted_pointer_parameters_in_wgsl for the data source.

Motivation

Additional details

Related issues and pull requests

Project issue: #36350

[github-actions]

Preview URLs

• /en-US/docs/Web/API/WGSLLanguageFeatures

External URLs (2)

URL: /en-US/docs/Web/API/WGSLLanguageFeatures
Title: WGSLLanguageFeatures

• https://google.github.io/tour-of-wgsl/types/pointers/passing_pointers/ (1 time) (Note! This may be a new URL 👀)
• https://gpuweb.github.io/gpuweb/wgsl/ (2 times) (Note! This may be a new URL 👀)

[beaufortfrancois]

LGTM