docs(connectivity_plus): update doc comment of Connectivity to reflect ConnectivityResultListX in connectivity_plus_platform_interface

Author: EchoEllet

packages/connectivity_plus/connectivity_plus/lib/connectivity_plus.dart

@@ -41,10 +41,20 @@ class Connectivity {
   /// status changes, this is a known issue that only affects simulators.
   /// For details see https://github.com/fluttercommunity/plus_plugins/issues/479.
   ///
-  /// The emitted list is never empty. In case of no connectivity, the list contains
+  /// The emitted list is never empty.
+  /// {@template no_connectivity_case}
+  /// In case of no connectivity, the list contains
   /// a single element of [ConnectivityResult.none]. Note also that this is the only
   /// case where [ConnectivityResult.none] is present.
   ///
+  /// Use `hasConnectivity` to determine whether any active network connection exists:
+  ///
+  /// ```dart
+  /// final result = await checkConnectivity();
+  /// print(result.hasConnectivity);
+  /// ```
+  /// {@endtemplate}
+  ///
   /// This method applies [Stream.distinct] over the received events to ensure
   /// only emitting when connectivity changes.
   Stream<List<ConnectivityResult>> get onConnectivityChanged {
@@ -57,9 +67,8 @@ class Connectivity {
   /// make a network request, it only gives you the radio status. Instead, listen
   /// for connectivity changes via [onConnectivityChanged] stream.
   ///
-  /// The returned list is never empty. In case of no connectivity, the list contains
-  /// a single element of [ConnectivityResult.none]. Note also that this is the only
-  /// case where [ConnectivityResult.none] is present.
+  /// The returned list is never empty.
+  /// {@macro no_connectivity_case}
   Future<List<ConnectivityResult>> checkConnectivity() {
     return _platform.checkConnectivity();
   }