chore: update swift transaction example (#105)

Author: DominicGBauer

client-sdk-references/swift.mdx

@@ -6,7 +6,7 @@ sidebarTitle: "Overview"
 <CardGroup cols={3}>
   <Card title="Source Code" icon="github" href="https://github.com/powersync-ja/powersync-swift/">
   Refer to the powersync-swift repo on GitHub.
-  </Card>  
+  </Card>
   <Card title="API Reference (Coming soon)" icon="book" href="">
   A full API Reference for this SDK is not yet available. This is planned for the V1 release.
   </Card>
@@ -326,7 +326,7 @@ func updateTodo(_ todo: Todo) async throws {
 
 func deleteTodo(id: String) async throws {
     try await db.writeTransaction(callback: { transaction in
-        _ = try await transaction.execute(
+        _ = transaction.execute(
                 sql: "DELETE FROM \(TODOS_TABLE) WHERE id = ?",
                 parameters: [id]
             )