[multicast_dns] Adjust README (flutter#5529)

- Improves link targets to be more directly useful.
- Removes the unnecessary code sections showing an import, since the install tab already demonstrates that.
- Removes the no-longer-needed exemption from the excerpt requirement.

Part of flutter/flutter#102679

packages/multicast_dns/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.3.2+6
+
+* Improves links in README.md.
+
 ## 0.3.2+5
 
 * Updates `PendingRequest` to be a `base class` for Dart 3.0 compatibility.

packages/multicast_dns/README.md

@@ -6,15 +6,9 @@ https://pub.dartlang.org/packages/multicast_dns)
 A Dart package to do service discovery over multicast DNS (mDNS), Bonjour, and Avahi.
 
 ## Usage
-To use this package, add `multicast_dns` as a
-[dependency in your pubspec.yaml file](https://flutter.io/platform-plugins/).
-
-## Example
 
-Import the library via
-``` dart
-import 'package:multicast_dns/multicast_dns.dart';
-```
+To use this package, add `multicast_dns` as a
+[dependency in your pubspec.yaml file](https://pub.dev/packages/multicast_dns/install).
 
-Then use the `MDnsClient` Dart class in your code. To see how this is done,
-check out the [example app](example/main.dart).
+[The example](https://pub.dev/packages/multicast_dns/example) demonstrates how
+to use the `MDnsClient` Dart class in your code.

packages/multicast_dns/pubspec.yaml

@@ -2,7 +2,7 @@ name: multicast_dns
 description: Dart package for performing mDNS queries (e.g. Bonjour, Avahi).
 repository: https://github.com/flutter/packages/tree/main/packages/multicast_dns
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+multicast_dns%22
-version: 0.3.2+5
+version: 0.3.2+6
 
 environment:
   sdk: ">=3.0.0 <4.0.0"

script/configs/temp_exclude_excerpt.yaml

@@ -13,7 +13,6 @@
 - image_picker_for_web
 - in_app_purchase/in_app_purchase
 - ios_platform_images
-- multicast_dns
 - palette_generator
 - pointer_interceptor
 - quick_actions/quick_actions