docs: restore JSDoc comment

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/stats/base/ndarray/nanmax-by/benchmark/benchmark.js

@@ -110,6 +110,11 @@ function createBenchmark( len ) {
 
 // MAIN //
 
+/**
+* Main execution sequence.
+*
+* @private
+*/
 function main() {
 	var len;
 	var min;