message: docs: adjust description to code example
  Remove promise's then(...) callback from description to match the code example's async/await syntax.
  PR Close
diff: @@ -1558,7 +1558,7 @@ You can consolidate the two `beforeEach()` functions into a single, async `befor
  The `compileComponents()` method returns a promise so you can perform the
  synchronous setup tasks _after_ compilation by moving the synchronous code
  -into a `then(...)` callback.
  +after the `await` keyword, where the promise has been resolved.
  <code-example
  path="testing/src/app/banner/banner-external.component.spec.ts"
  