Modify scalar's url in overview.md

[lonyehan]

fixed the scalars's url

[github-actions]

Changes in this PR will be published to the following url to try(check status of TypeSpec Pull Request Try It pipeline for publish status):
Playground: https://cadlplayground.z22.web.core.windows.net/prs/2648/

Website: https://tspwebsitepr.z22.web.core.windows.net/prs/2648/

[timotheeguerin]

Thanks @lonyehan for the fix. Just to note fixing the docs in docs/ folder will apply to the next version of the docs if you wanted to fix the latest as well can you make the same cahnge in packages/website/versioned_docs/latest

[lonyehan]

Thanks @lonyehan for the fix. Just to note fixing the docs in docs/ folder will apply to the next version of the docs if you wanted to fix the latest as well can you make the same cahnge in packages/website/versioned_docs/latest

Thanks @timotheeguerin for remind me that.
I will modify the document in packages/website/versioned_docs/latest too.

[lonyehan]

@microsoft-github-policy-service agree