process,worker: ensure code after exit() effectless

fix typo

Author: ywave620

lib/internal/process/per_thread.js

@@ -203,7 +203,7 @@ function wrapProcessMethods(binding) {
     // check to throw the termination exception. Because v8 performs
     // stack guard check upon every function call, we give it a chance.
     //
-    // Without this, user code followed by `process.exit()` would take effect.
+    // Without this, user code after `process.exit()` would take effect.
     // test/parallel/test-worker-voluntarily-exit-followed-by-addition.js
     // test/parallel/test-worker-voluntarily-exit-followed-by-throw.js
     nop();