docs(testing): clarify beforeAll in describe vs. outside (#6294)

testing/bdd.ts

@@ -19,10 +19,10 @@
  * the test case passes. The *All hooks will be called once for the whole group
  * while the *Each hooks will be called for each individual test case.
  *
- * - `beforeAll`: Runs before all of the tests in the test suite.
- * - `afterAll`: Runs after all of the tests in the test suite finish.
- * - `beforeEach`: Runs before each of the individual test cases in the test suite.
- * - `afterEach`: Runs after each of the individual test cases in the test suite.
+ * - `beforeAll`: Runs before all of the tests in the group.
+ * - `afterAll`: Runs after all of the tests in the group finish.
+ * - `beforeEach`: Runs before each of the individual test cases in the group.
+ * - `afterEach`: Runs after each of the individual test cases in the group.
  *
  * If a hook is registered at the top level, a global test suite will be registered
  * and all tests will belong to it. Hooks registered at the top level must be
@@ -836,9 +836,9 @@ function addHook<T>(
 }
 
 /**
- * Run some shared setup before all of the tests in the suite.
- * `beforeAll` is only provided for compatibility. Top-level
- * initialization code should be used instead.
+ * Run some shared setup before all of the tests in the group.
+ * Useful for async setup in `describe` blocks. Outside them,
+ * top-level initialization code should be used instead.
  *
  * @example Usage
  * ```ts