[url_launcher] Remove incorrect SMS instructions (#7807)

Removes incorrect instructions for SMS that were added in flutter/plugins#6042. These instructions would double-encode the body, causing issues.

This removes, rather than fixes, the instructions because the `sms:` scheme isn't particularly well defined, and has inconsistent handling across platforms (see flutter/flutter#18823 and flutter/flutter#156281 for some examples), so no simple instructions will work everywhere. Handling that kind of platform difference is out of scope for this package and its instructions.

Fixes flutter/flutter#156281

Author: stuartmorgan-g

packages/url_launcher/url_launcher/CHANGELOG.md

@@ -1,5 +1,6 @@
-## NEXT
+## 6.3.1
 
+* Removes incorrect SMS instructions from README.
 * Updates minimum supported SDK version to Flutter 3.19/Dart 3.3.
 
 ## 6.3.0

packages/url_launcher/url_launcher/README.md

@@ -170,19 +170,6 @@ String? encodeQueryParameters(Map<String, String> params) {
   launchUrl(emailLaunchUri);
 ```
 
-Encoding for `sms` is slightly different:
-
-<?code-excerpt "lib/encoding.dart (sms)"?>
-```dart
-final Uri smsLaunchUri = Uri(
-  scheme: 'sms',
-  path: '0118 999 881 999 119 7253',
-  queryParameters: <String, String>{
-    'body': Uri.encodeComponent('Example Subject & Symbols are allowed!'),
-  },
-);
-```
-
 ### URLs not handled by `Uri`
 
 In rare cases, you may need to launch a URL that the host system considers

packages/url_launcher/url_launcher/example/lib/encoding.dart

@@ -31,10 +31,6 @@ void main() => runApp(
                 onPressed: _composeMail,
                 child: Text('Compose an email'),
               ),
-              ElevatedButton(
-                onPressed: _composeSms,
-                child: Text('Compose a SMS'),
-              ),
             ],
           ),
         ),
@@ -54,17 +50,3 @@ void _composeMail() {
   launchUrl(emailLaunchUri);
 // #enddocregion encode-query-parameters
 }
-
-void _composeSms() {
-// #docregion sms
-  final Uri smsLaunchUri = Uri(
-    scheme: 'sms',
-    path: '0118 999 881 999 119 7253',
-    queryParameters: <String, String>{
-      'body': Uri.encodeComponent('Example Subject & Symbols are allowed!'),
-    },
-  );
-// #enddocregion sms
-
-  launchUrl(smsLaunchUri);
-}

packages/url_launcher/url_launcher/pubspec.yaml

@@ -3,7 +3,7 @@ description: Flutter plugin for launching a URL. Supports
   web, phone, SMS, and email schemes.
 repository: https://github.com/flutter/packages/tree/main/packages/url_launcher/url_launcher
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+url_launcher%22
-version: 6.3.0
+version: 6.3.1
 
 environment:
   sdk: ^3.3.0