docs: Fix minor type error in Tus upload code (#44760)

## I have read the
[CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md)
file.

YES

## What kind of change does this PR introduce?

Docs update

## What is the current behavior?

A very minor type fix of the tus sample code we have in the docs.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
* Fixed resumable upload example to use correct format for the cache
control parameter in code snippets.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Chris Chinchilla <chris.ward@supabase.io>

apps/docs/content/guides/storage/uploads/resumable-uploads.mdx

@@ -56,7 +56,7 @@ Instead of `https://project-id.supabase.co` use `https://project-id.storage.supa
                     bucketName: bucketName,
                     objectName: fileName,
                     contentType: 'image/png',
-                    cacheControl: 3600,
+                    cacheControl: '3600',
                     metadata: JSON.stringify({ // custom metadata passed to the user_metadata column
                        yourCustomMetadata: true,
                     }),