Fix doxygen: don't describe return of void method

Change-Id: Ib5795e44cbf23155dc2d2a7dcd6466e68dac4e2d
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/28281
Reviewed-by: Sarah Mashayekhi <sarahmashay@google.com>
Commit-Queue: Sarah Mashayekhi <sarahmashay@google.com>
diff --git a/src/writer/writer.h b/src/writer/writer.h
index 7819420..51e0307 100644
--- a/src/writer/writer.h
+++ b/src/writer/writer.h
@@ -32,7 +32,6 @@
   const std::string& error() const { return error_; }
 
   /// Resets the generator
-  /// @returns nothing
   virtual void Reset() = 0;
 
   /// Converts the module into the desired format