refactor(app_configuration): remove user content limits description text

- Remove the Text widget displaying the user content limits description
- Remove the SizedBox for spacing below the description text

Author: fulleni

lib/app_configuration/widgets/user_preference_limits_form.dart

@@ -142,13 +142,6 @@ class _UserPreferenceLimitsFormState extends State<UserPreferenceLimitsForm>
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       children: [
-        Text(
-          l10n.userContentLimitsDescription,
-          style: Theme.of(context).textTheme.bodySmall?.copyWith(
-            color: Theme.of(context).colorScheme.onSurface.withOpacity(0.7),
-          ),
-        ),
-        const SizedBox(height: AppSpacing.lg),
         Align(
           alignment: AlignmentDirectional.centerStart,
           child: SizedBox(