doc: fix init flow example code

[jenn-le]

Minor fix for example code in recommended init flow doc

[Copilot]

Pull request overview

This PR fixes example code in the recommended initialization flow documentation by removing unnecessary explicit type annotations from two variable declarations. The changes improve code readability and align with TypeScript best practices of using type inference when the type is clear from the return value.

• Removed redundant TreeView type annotations from const view declarations
• Fixed spacing issue in the second declaration (TreeView= → =)

[github-actions]

🔗 No broken links found! ✅

Your attention to detail is admirable.

linkcheck output

> [email protected] ci:check-links /home/runner/work/FluidFramework/FluidFramework/docs
> start-server-and-test "npm run serve -- --no-open" 3000 check-links

1: starting server using command "npm run serve -- --no-open"
and when url "[ 'http://127.0.0.1:3000' ]" is responding with HTTP status code 200
running tests using command "npm run check-links"


> [email protected] serve
> docusaurus serve --no-open

[SUCCESS] Serving "build" directory at: http://localhost:3000/

> [email protected] check-links
> linkcheck http://localhost:3000 --skip-file skipped-urls.txt

Crawling...

Stats:
  248785 links
    1796 destination URLs
    2036 URLs ignored
       0 warnings
       0 errors