fix comment

substrate/frame/contracts/src/benchmarking/call_builder.rs

@@ -60,7 +60,7 @@ impl<T> Drop for LeakReclaimer<T> {
 	}
 }
 
-/// A builder use to prepare a benchmark contracts call.
+/// A builder used to prepare a contract call.
 pub struct CallBuilder<T: Config> {
 	caller: T::AccountId,
 	dest: T::AccountId,