docs: update benchmark files for consistency and clarity

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---

Author: gururaj1512

lib/node_modules/@stdlib/stats/base/nanmskmax/benchmark/benchmark.js

@@ -46,8 +46,11 @@ var options = {
 * @returns {Function} benchmark function
 */
 function createBenchmark( len ) {
-	var mask = bernoulli( len, 0.2, options );
-	var x = uniform( len, -10.0, 10.0, options );
+	var mask;
+	var x;
+
+	mask = bernoulli( len, 0.2, options );
+	x = uniform( len, -10.0, 10.0, options );
 	return benchmark;
 
 	function benchmark( b ) {

lib/node_modules/@stdlib/stats/base/nanmskmax/benchmark/benchmark.ndarray.js

@@ -46,8 +46,11 @@ var options = {
 * @returns {Function} benchmark function
 */
 function createBenchmark( len ) {
-	var mask = bernoulli( len, 0.2, options );
-	var x = uniform( len, -10.0, 10.0, options );
+	var mask;
+	var x;
+
+	mask = bernoulli( len, 0.2, options );
+	x = uniform( len, -10.0, 10.0, options );
 	return benchmark;
 
 	function benchmark( b ) {