doc: fix math error in process.md

Updates benchmark result output to actual real result.

1 * 1e9 + 552 = 1000000552 not 1000000527

PR-URL: https://github.com/nodejs/node/pull/11158
Reviewed-By: Anna Henningsen <anna@addaleax.net>

doc/api/process.md

@@ -1052,7 +1052,7 @@ setTimeout(() => {
   // [ 1, 552 ]
 
   console.log(`Benchmark took ${diff[0] * NS_PER_SEC + diff[1]} nanoseconds`);
-  // benchmark took 1000000527 nanoseconds
+  // benchmark took 1000000552 nanoseconds
 }, 1000);
 ```