Add information on packed_4x8_integer_dot_product extension (mdn#36898)

* Add information on packed_4x8_integer_dot_product extension

* fix linting error

* Change table to dl

* attempt to make text less confusing

files/en-us/web/api/wgsllanguagefeatures/index.md

@@ -22,10 +22,27 @@ The `WGSLLanguageFeatures` object is accessed via the {{domxref("GPU.wgslLanguag
 
 The following WGSL language extensions are defined at [WGSL language extensions](https://gpuweb.github.io/gpuweb/wgsl/#language-extension) in the WGSL specification. Bear in mind that the exact set of features available will vary across implementations and physical devices, and may change over time.
 
-| Feature name                                                                                    | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
-| ----------------------------------------------------------------------------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| <a name="readonly_and_readwrite_storage_textures">`readonly_and_readwrite_storage_textures`</a> | When available, allows the `"read-only"` and `"read-write"` [`storageTexture.access`](/en-US/docs/Web/API/GPUDevice/createBindGroupLayout#access) values to be set when specifying storage texture bind group entry types in a bind group layout. These enable WSGL code to read storage textures, and read/write storage textures, respectively.                                                                                                                                         |
-| <a name="unrestricted_pointer_parameters">`unrestricted_pointer_parameters`</a>                 | <p>Loosens restrictions on pointers being passed to WGSL functions. When available, the following are allowed:</p><ul><li>Parameter pointers to storage, uniform, and workgroup address spaces being passed to user-declared functions.</li><li>Pointers to structure members and array elements being passed to user-declared functions.</li></ul><p>See [Pointers As Function Parameters](https://google.github.io/tour-of-wgsl/types/pointers/passing_pointers/) for more details.</p> |
+- `packed_4x8_integer_dot_product`
+
+  - : Allows **DP4a** (Dot Product of 4 Elements and Accumulate) GPU instructions to be used via your WGSL code. These efficiently perform 8-bit integer dot products to accelerate computation, saving memory and network bandwidth and improving performance compared with the equivalent `f32` versions. They are commonly used in machine learning models in inferencing, within AI frameworks.
+
+    Specifically, when `packed_4x8_integer_dot_product` is available, WGSL code can use:
+
+    - 32-bit integer scalars packing 4-component vectors of 8-bit integers to be used as inputs to dot product instructions (via the `dot4U8Packed()` and `dot4I8Packed()` built-in functions).
+    - Packing and unpacking instructions with packed 4-component vectors of 8-bit integers (via built-in functions such as `pack4xI8()` and `pack4xI8Clamp()`).
+
+- `readonly_and_readwrite_storage_textures`
+
+  - : When available, allows the `"read-only"` and `"read-write"` [`storageTexture.access`](/en-US/docs/Web/API/GPUDevice/createBindGroupLayout#access) values to be set when specifying storage texture bind group entry types in a bind group layout. These enable WSGL code to read storage textures, and read/write storage textures, respectively.
+
+- `unrestricted_pointer_parameters`
+
+  - : Loosens restrictions on pointers being passed to WGSL functions. When available, the following are allowed:
+
+    - 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.
+
+      See [Pointers As Function Parameters](https://google.github.io/tour-of-wgsl/types/pointers/passing_pointers/) for more details.
 
 ## Instance properties