docs(useDrauu): improve the documention

[qinwencheng]

Description

• Add installation tips for the drauu library
• Import useDrauu by using tree shaking (to fix useDrauu: Some tips are missing from the document #1842)

Additional context

---

What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

Before submitting the PR, please make sure you do the following

• Read the Contributing Guidelines.
• Read the Pull Request Guidelines.
• Check that there isn't already a PR that solves the problem the same way to avoid creating a duplicate.
• Provide a description in this PR that addresses what the PR is solving, or reference the issue that it solves (e.g. fixes #123).
• Ideally, include relevant tests that fail without this PR but pass with it.

[mzcc666GtHb]

When I execute the Vite build

Could not resolve "async-validator" imported by "@vueuse/integrations". Is it installed?
at optional-peer-dep:__vite-optional-peer-dep:async-validator:@vueuse/integrations (integrations:1:7)
at __require (chunk-TWLJ45QX.js?v=2802e95a:8:50)
at index.mjs:2:20

[alexinea]

When I execute the Vite build

Could not resolve "async-validator" imported by "@vueuse/integrations". Is it installed? at optional-peer-dep:__vite-optional-peer-dep:async-validator:@vueuse/integrations (integrations:1:7) at __require (chunk-TWLJ45QX.js?v=2802e95a:8:50) at index.mjs:2:20

That just happened to me. Excuse me, how do you solve it?

[alphaelf]

use just like this:

import { useAsyncValidator } from '@vueuse/integrations/useAsyncValidator'

and it's works fine