Update raw tables documentation (#203)

* Update raw tables documentation to remove mention of using raw tables for advanced SQLite features

* Add warning about advanced SQLite features in raw tables documentation

---------

Co-authored-by: Kobie Botha <[email protected]>

Author: dean-journeyapps

usage/use-case-examples/raw-tables.mdx

@@ -33,12 +33,15 @@ Also note that raw tables are only supported by the new [Rust-based sync client]
 
 Consider raw tables when you need:
 
-- **Advanced SQLite features** like `FOREIGN KEY` and `ON DELETE CASCADE` constraints
 - **Indexes** - PowerSync's default schema has basic support for indexes on columns, while raw tables give you complete control to create indexes on expressions, use `GENERATED` columns, etc
 - **Improved performance** for complex queries (e.g., `SELECT SUM(value) FROM transactions`) - raw tables more efficiently get these values directly from the SQLite column, instead of extracting the value from the JSON object on every row
 - **Reduced storage overhead** - eliminate JSON object overhead for each row in `ps_data__<table>.data` column
 - **To manually create tables** - Sometimes you need full control over table creation, for example when implementing custom triggers
 
+<Warning>
+**Advanced SQLite features** like `FOREIGN KEY` and `ON DELETE CASCADE` constraints may need special handling. If your use case requires these features, please reach out to us for guidance and potential workarounds.
+</Warning>
+
 ## How Raw Tables Work
 
 ### Current JSON-Based System