docs(bench-kernel): typo

Signed-off-by: Woshiluo Luo <woshiluo.luo@outlook.com>

bench-kernel/scripts/rustsbi-bench-kernel.its

@@ -1,11 +1,11 @@
 /*
- * Configuration to load RustSBI before RustSBI Test Kernel
+ * Configuration to load RustSBI before RustSBI Bench Kernel
  */
  
 /dts-v1/;
 
 / {
-			description = "Configuration to load RustSBI before RustSBI Test Kernel";
+			description = "Configuration to load RustSBI before RustSBI Bench Kernel";
 
 			images {
 				kernel {