Update shader validation message to reflect new @ binding syntax

Fixed: dawn:1317
Change-Id: Ib8eb4068ae9c52513945a51fe0a7a88a6e3fa43e
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/83062
Reviewed-by: Brandon Jones <bajones@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>

src/dawn/native/ShaderModule.cpp

@@ -589,8 +589,8 @@ namespace dawn::native {
             for (const auto& [bindingId, bindingInfo] : entryPoint.bindings[group]) {
                 DAWN_TRY_CONTEXT(ValidateCompatibilityOfSingleBindingWithLayout(
                                      device, layout, entryPoint.stage, bindingId, bindingInfo),
-                                 "validating that the entry-point's declaration for [[group(%u), "
-                                 "binding(%u)]] matches %s",
+                                 "validating that the entry-point's declaration for @group(%u) "
+                                 "@binding(%u) matches %s",
                                  static_cast<uint32_t>(group), static_cast<uint32_t>(bindingId),
                                  layout);
             }

src/dawn/native/ShaderModule.h

@@ -166,7 +166,7 @@ namespace dawn::native {
     // ShaderModuleBase.
     struct EntryPointMetadata {
         // bindings[G][B] is the reflection data for the binding defined with
-        // [[group=G, binding=B]] in WGSL / SPIRV.
+        // @group(G) @binding(B) in WGSL / SPIRV.
         BindingInfoArray bindings;
 
         struct SamplerTexturePair {