docs: fix comments api/beforeEach

docs/api/index.md

@@ -1468,10 +1468,10 @@ These functions allow you to hook into the life cycle of tests to avoid repeatin
   import { beforeEach } from 'vitest'
 
   beforeEach(async () => {
-    // called once before all tests run
+    // called once before each test run
     await prepareSomething()
 
-    // clean up function, called once after all tests run
+    // clean up function, called once after each test run
     return async () => {
       await resetSomething()
     }