docs: update flutter realtime reference docs

spec/supabase_dart_v1.yml

@@ -752,7 +752,7 @@ functions:
       Subscribe to realtime changes in your database.
     title: 'on().subscribe()'
     notes: |
-      - Realtime is disabled by default for new Projects for better database performance and security. You can turn it on by [managing replication](/docs/guides/database/api#managing-realtime).
+      - Realtime is disabled by default for new tables. You can turn it on by [managing replication](/docs/guides/realtime/extensions/postgres-changes#replication-setup).
       - If you want to receive the "previous" data for updates and deletes, you will need to set `REPLICA IDENTITY` to `FULL`, like this: `ALTER TABLE your_table REPLICA IDENTITY FULL;`
     examples:
       - id: listen-to-all-database-changes
@@ -907,11 +907,12 @@ functions:
 
   - id: stream
     description: |
-      Notifies of data at the queried table.
+      Returns real-time data from your table as a `Stream`.
     title: 'stream()'
     notes: |
-      - `stream()` will emit the initial data as well as any further change on the database as `Stream` of `List<Map<String, dynamic>>` by combining Postgrest and Realtime.
-      - Takes a list of primary key columns as its argument.
+      - Realtime is disabled by default for new tables. You can turn it on by [managing replication](/docs/guides/realtime/extensions/postgres-changes#replication-setup).
+      - `stream()` will emit the initial data as well as any further change on the database as `Stream<List<Map<String, dynamic>>>` by combining Postgrest and Realtime.
+      - Takes a list of primary key columns as its argument to be used to update and deleting the proper record internally.
       - The following filters are available
         - `.eq('column', value)` listens to rows where the column equals the value
         - `.neq('column', value)` listens to rows where the column does not equal the value