docs(bench): fix doctest annotations for Benchmark properties

Author: DivitJain26

lib/node_modules/@stdlib/bench/harness/docs/types/index.d.ts

@@ -111,7 +111,7 @@ interface Benchmark {
 	*
 	* @example
 	* var str = b.name;
-	* // throws <ReferenceError>
+	* // returns <string>
 	*/
 	readonly name: string;
 
@@ -120,7 +120,7 @@ interface Benchmark {
 	*
 	* @example
 	* var iter = b.iterations;
-	* // throws <ReferenceError>
+	* // returns <number>
 	*/
 	readonly iterations: number;