bench: refactor to use string interpolation in buffer/from-arraybuffer

PR-URL: #9554
Ref: #8647
Reviewed-by: Athan Reines <[email protected]>

Author: ivishal-g

lib/node_modules/@stdlib/buffer/from-arraybuffer/benchmark/benchmark.length.js

@@ -25,6 +25,7 @@ var pow = require( '@stdlib/math/base/special/pow' );
 var isBuffer = require( '@stdlib/assert/is-buffer' );
 var ArrayBuffer = require( '@stdlib/array/buffer' );
 var Uint8Array = require( '@stdlib/array/uint8' );
+var format = require( '@stdlib/string/format' );
 var pkg = require( './../package.json' ).name;
 var arraybuffer2buffer = require( './../lib' );
 
@@ -95,7 +96,7 @@ function main() {
 	for ( i = min; i <= max; i++ ) {
 		len = pow( 10, i );
 		f = createBenchmark( len );
-		bench( pkg+':len='+len, f );
+		bench( format( '%s:len=%d', pkg, len ), f );
 	}
 }