bench: fix descriptions

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

Author: kgryte

lib/node_modules/@stdlib/plot/vega/base/assert/is-field-array/benchmark/benchmark.js

@@ -23,13 +23,14 @@
 var bench = require( '@stdlib/bench' );
 var isBoolean = require( '@stdlib/assert/is-boolean' ).isPrimitive;
 var Field = require( '@stdlib/plot/vega/field/ctor' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var isFieldArray = require( './../lib' );
 
 
 // MAIN //
 
-bench( pkg+'::true', function benchmark( b ) {
+bench( format( '%s::true', pkg ), function benchmark( b ) {
 	var values;
 	var out;
 	var i;
@@ -59,7 +60,7 @@ bench( pkg+'::true', function benchmark( b ) {
 	b.end();
 });
 
-bench( pkg+'::false', function benchmark( b ) {
+bench( format( '%s::false', pkg ), function benchmark( b ) {
 	var values;
 	var out;
 	var v;