Correct typo run_llama2.sh > run-llama2.sh (#9149)

docs/backend/SYCL.md

@@ -336,12 +336,12 @@ Choose one of following methods to run.
 - Use device 0:
 
 ```sh
-./examples/sycl/run_llama2.sh 0
+./examples/sycl/run-llama2.sh 0
 ```
 - Use multiple devices:
 
 ```sh
-./examples/sycl/run_llama2.sh
+./examples/sycl/run-llama2.sh
 ```
 
 2. Command line