Fix comment

Author: simolus3

packages/sqlite_async/lib/src/web/worker/worker.dart

@@ -7,16 +7,15 @@
 /// dart compile js \
 ///   lib/src/web/worker/db_worker.dart \
 ///   -o build/db_worker.js \
-///   -O4
+///   -O4 \
 ///   -Dsqlite3.dartbigints=false
 /// ```
 ///
 /// The output should then be included in each project's `web` directory.
 ///
 /// Disabling `sqlite3.dartbigints` as a compile-time option reduces the size of
 /// the worker by disabling support for [BigInt] values which are implemented in
-/// Dart. The worker still supports native JavaScript bigint values, so this
-/// doesn't affect functionality.
+/// Dart. This doesn't affect functionality, and is purely an optimization.
 library;
 
 import 'package:sqlite3_web/sqlite3_web.dart';