docs: edit broken link for collection interface (#825)

* docs: edit broken link for collection interface

* docs: fix broken link to collection options creator guide

Author: binishjoshi

docs/overview.md

@@ -203,9 +203,9 @@ The collection will use the schema for its type inference. If you provide a sche
 
 #### Creating Custom Collection Types
 
-You can create your own collection types by implementing the `Collection` interface found in [`../packages/db/src/collection.ts`](https://github.com/TanStack/db/blob/main/packages/db/src/collection.ts).
+You can create your own collection types by implementing the `Collection` interface found in [`../packages/db/src/collection/index.ts`](https://github.com/TanStack/db/blob/main/packages/db/src/collection/index.ts).
 
-See the existing implementations in [`../packages/db`](https://github.com/TanStack/db/tree/main/packages/db), [`../packages/query-db-collection`](https://github.com/TanStack/db/tree/main/packages/query-db-collection), [`../packages/electric-db-collection`](https://github.com/TanStack/db/tree/main/packages/electric-db-collection) and [`../packages/trailbase-db-collection`](https://github.com/TanStack/db/tree/main/packages/trailbase-db-collection) for reference. Also see the [Collection Options Creator guide](./guides/collection-options-creator.md) for a pattern to create reusable collection configuration factories.
+See the existing implementations in [`../packages/db`](https://github.com/TanStack/db/tree/main/packages/db), [`../packages/query-db-collection`](https://github.com/TanStack/db/tree/main/packages/query-db-collection), [`../packages/electric-db-collection`](https://github.com/TanStack/db/tree/main/packages/electric-db-collection) and [`../packages/trailbase-db-collection`](https://github.com/TanStack/db/tree/main/packages/trailbase-db-collection) for reference. Also see the [Collection Options Creator guide](../guides/collection-options-creator.md) for a pattern to create reusable collection configuration factories.
 
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