docs(flutter): Use sentry flutter init in samples

platform-includes/configuration/allow-urls/flutter.mdx

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+```dart
+import 'package:flutter/widgets.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
+
+Future<void> main() async {
+  await SentryFlutter.init(
+    (options) {
+      options.dsn = '___PUBLIC_DSN___';
+      options.allowUrls = ["^https://sentry.com.*\$", "my-custom-domain"];
+    },
+    appRunner: initApp, // Init your App.
+  );
+}
+```

platform-includes/configuration/before-send-hint/flutter.mdx

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+```dart
+import 'package:flutter/widgets.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
+
+FutureOr<SentryEvent?> beforeSend(SentryEvent event, Hint hint) async {
+  return hint is MyHint ? null : event;
+}
+
+Future<void> main() async {
+  await SentryFlutter.init((options) => options.beforeSend = beforeSend);
+}
+```

platform-includes/configuration/before-send/flutter.mdx

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+```dart
+import 'package:flutter/widgets.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
+
+FutureOr<SentryEvent?> beforeSend(SentryEvent event, Hint hint) async {
+  // Modify the event here:
+  event = event.copyWith(serverName: null); // Don't send server names.
+  return event;
+}
+
+Future<void> main() async {
+  await SentryFlutter.init((options) => options.beforeSend = beforeSend);
+}
+```

platform-includes/configuration/deny-urls/flutter.mdx

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+```dart
+import 'package:flutter/widgets.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
+
+Future<void> main() async {
+  await SentryFlutter.init(
+    (options) {
+      options.dsn = '___PUBLIC_DSN___';
+      options.denyUrls = ["^.*ends-with-this\$", "denied-url"];
+    },
+    appRunner: initApp, // Init your App.
+  );
+}
+```

platform-includes/configuration/sample-rate/flutter.mdx

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+```dart
+import 'package:flutter/widgets.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
+
+Future<void> main() async {
+  // Capture only 25% of events
+  await SentryFlutter.init((options) => options.sampleRate = 0.25);
+}
+```

platform-includes/set-fingerprint/basic/flutter.mdx

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+```dart
+import 'package:flutter/widgets.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
+
+FutureOr<SentryEvent?> beforeSend(SentryEvent event, Hint hint) async {
+  if (event.throwable is DatabaseException) {
+    event = event.copyWith(fingerprint: ['database-connection-error']);
+  }
+  return event;
+}
+
+Future<void> main() async {
+  await SentryFlutter.init((options) => options.beforeSend = beforeSend);
+}
+```

platform-includes/set-fingerprint/database-connection/flutter.mdx

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+```dart
+import 'package:flutter/widgets.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
+
+FutureOr<SentryEvent?> beforeSend(SentryEvent event, Hint hint) async {
+  if (event.throwable is DatabaseException) {
+    event = event.copyWith(fingerprint: ['database-connection-error']);
+  }
+  return event;
+}
+
+Future<void> main() async {
+  await SentryFlutter.init((options) => options.beforeSend = beforeSend);
+}
+```

platform-includes/set-fingerprint/rpc/flutter.mdx

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+```dart
+import 'package:flutter/widgets.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
+
+class MyRpcException implements Exception {
+  final String function;
+  final int httpStatusCode;
+
+  MyRpcException(this.function, this.httpStatusCode);
+}
+
+FutureOr<SentryEvent?> beforeSend(SentryEvent event, Hint hint) async {
+  if (event.throwable is MyRpcException) {
+    final exception = event.throwable as MyRpcException;
+    event = event.copyWith(fingerprint: [
+      '{{ default }}',
+      exception.function,
+      exception.httpStatusCode.toString(),
+    ]);
+  }
+  return event;
+}
+
+Future<void> main() async {
+  await SentryFlutter.init((options) => options.beforeSend = beforeSend);
+}
+```

platform-includes/user-feedback/sdk-api-example/flutter.mdx

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+```dart
+import 'package:flutter/widgets.dart';
+import 'package:sentry_flutter/sentry_flutter.dart';
+
+// Option 1: Retrieving SentryId from beforeSend
+SentryId sentryId = SentryId.empty();
+
+await SentryFlutter.init((options) {
+  options.beforeSend = (event, hint) async {
+    sentryId = event.eventId;
+    return event;
+  };
+});
+
+// Option 2: Retrieving SentryId from the method capturing the event
+SentryId sentryId = Sentry.captureMessage("My message");
+
+// Option 3: Retrieving SentryId from the beforeSend callback
+SentryId sentryId = Sentry.lastEventId;
+
+final userFeedback = SentryUserFeedback(
+    eventId: sentryId,
+    comments: 'Hello World!',
+    email: '[email protected]',
+    name: 'John Doe',
+);
+
+Sentry.captureUserFeedback(userFeedback);
+```