Add a database corruption warning for the indexeddb adapter to the documentation.

### Issue
The use of the adapter results in reproducible data loss, as documented in #8494 and #8599. This issue should be addressed in the documentation. I recommend removing all mentions of the adapter or adding a warning note wherever it is referenced.

### Info
- Environment: browser / docs
- Platform: Chrome, FF, Safari, Edge
- Adapter: indexeddb
- Server: -

### Reproduce
Steps to reproduce are documented in #8494 and #8599

Read the reproducible data-loss reports in #8494 and #8599 first, then review the documentation references to the indexeddb adapter. Done means the documentation consistently removes those mentions or adds a clear corruption warning wherever the adapter is referenced.

Written by the indexing model from the issue text.