fix benchmarking subcommand

Author: bernardoaraujor

content/md/en/docs/reference/how-to-guides/weights/add-benchmarks.md

@@ -182,7 +182,7 @@ The Benchmarking CLI has a lot of options which can help you automate your bench
 Execute the following command to run standard benchmarking for your `pallet_you_created`:
 
 ```bash
-./target/release/node-template benchmark \
+./target/release/node-template benchmark pallet \
     --chain dev \
     --execution wasm \
     --wasm-execution compiled \