Fix doxygen comment

Change-Id: I5977c7fe09f80e9da9438e7842fdfdf44346c839
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/37220
Commit-Queue: David Neto <dneto@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Auto-Submit: David Neto <dneto@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
diff --git a/src/writer/wgsl/generator_impl.h b/src/writer/wgsl/generator_impl.h
index f21b602..9b25e82 100644
--- a/src/writer/wgsl/generator_impl.h
+++ b/src/writer/wgsl/generator_impl.h
@@ -53,7 +53,7 @@
 class GeneratorImpl : public TextGenerator {
  public:
   /// Constructor
-  /// @param module the module to generate
+  /// @param mod the module to generate
   explicit GeneratorImpl(ast::Module* mod);
   ~GeneratorImpl();