Fix typo on AsyncStorage section

[gaguirre]

Issue: In the AsyncStorage section of the docs, there is a typo on the require causing the AsyncStorage from react-native-community to be never used.

What I did

Fix that typo.

How to test

• ✖️Is this testable with Jest or Chromatic screenshots?
• ✖️Does this need a new example in the kitchen sink apps?
• ✅Does this need an update to the documentation?

Despite it's just a change in the docs, it can be tested by checking there is no warning when using the AsyncStorage from react-native-community

const StorybookUIRoot = getStorybookUI({
  asyncStorage: require('@react-native-community/async-storage').default,
})

Versus following the previous doc, which will cause a warning

const StorybookUIRoot = getStorybookUI({
  asyncStorage: require('@react-native-community/async-storage').AsyncStorage,
})

Note: I can't set a documentation label as suggested

[shilman]

LGTM! Thanks!!! 🙏