Update indexeddb/article.md - add warning about code rollback

[catnipan]

add a warning about rollback that might be helpful for developers who are considering indexDB

[CLAassistant]

All committers have signed the CLA.

[catnipan]

Not sure about this.

I think it's already implicit in the warn header (preceding line)

The new warn is a general version management problem and proper testing shoud catch it, the original explains a really hard to catch issue you shoud be aware of

I think this might be helpful for frontend engineers who are just getting introduced to IndexedDB. Since it’s often their first time working with a stateful system like a database, they may not be familiar with concepts like database migration.

In addition, IndexedDB can be especially tricky because it operates outside the developer’s direct control.