test: fix typo of test-benchmark-readline.js

"bechmark" -> "benchmark" in test-benchmark-readline.js.
And fix test name in test-benchmark-validators.js.

Author: deokjinkim

test/benchmark/test-bechmark-readline.js test/benchmark/test-benchmark-readline.jstest/benchmark/test-bechmark-readline.js renamed to test/benchmark/test-benchmark-readline.js

@@ -2,7 +2,7 @@
 
 require('../common');
 
-// Minimal test for assert benchmarks. This makes sure the benchmarks aren't
+// Minimal test for validators benchmarks. This makes sure the benchmarks aren't
 // completely broken but nothing more than that.
 const runBenchmark = require('../common/benchmark');