fix: changed docs wording

Author: hahnandrew

packages/amplify_core/doc/lib/auth.dart

@@ -489,7 +489,7 @@ Future<void> fetchCurrentUserDevice() async {
     final device = await Amplify.Auth.fetchCurrentDevice();
     safePrint('Device: $device');
   } on AuthException catch (e) {
-    safePrint('Get current device failed with error: $e');
+    safePrint('Fetch current device failed with error: $e');
   }
 }
 // #enddocregion fetch-current-device

packages/amplify_core/lib/src/category/amplify_auth_category.dart

@@ -1376,7 +1376,7 @@ class AuthCategory extends AmplifyCategory<AuthPluginInterface> {
   ///     final device = await Amplify.Auth.fetchCurrentDevice();
   ///     safePrint('Device: $device');
   ///   } on AuthException catch (e) {
-  ///     safePrint('Get current device failed with error: $e');
+  ///     safePrint('Fetch current device failed with error: $e');
   ///   }
   /// }
   /// ```