WIP: docs(wgsl-in): add text for all EnableExtensions variants

TODO: `CHANGELOG`

Author: ErichDonGubler

naga/src/front/wgsl/parse/directive/enable_extension.rs

@@ -10,13 +10,19 @@ use alloc::boxed::Box;
 /// Tracks the status of every enable-extension known to Naga.
 #[derive(Clone, Debug, Eq, PartialEq)]
 pub struct EnableExtensions {
+    /// Whether `enable wgpu_mesh_shader;` was written earlier in the shader module.
     wgpu_mesh_shader: bool,
+    /// Whether `enable wgpu_ray_query;` was written earlier in the shader module.
     wgpu_ray_query: bool,
+    /// Whether `enable wgpu_ray_query_vertex_return;` was written earlier in the shader module.
     wgpu_ray_query_vertex_return: bool,
+    /// Whether `enable dual_source_blending;` was written earlier in the shader module.
     dual_source_blending: bool,
     /// Whether `enable f16;` was written earlier in the shader module.
     f16: bool,
+    /// Whether `enable clip_distances;` was written earlier in the shader module.
     clip_distances: bool,
+    /// Whether `enable wgpu_cooperative_matrix;` was written earlier in the shader module.
     wgpu_cooperative_matrix: bool,
 }