Generate useless documentation for return value

[JohanLarsson]

Before:

        /// <summary>
        /// Create a <see cref="ReadOnlyIListView{T}"/> from <paramref name="source"/>.
        /// </summary>
        /// <typeparam name="T">The type of the items in the collection.</typeparam>
        /// <param name="source">The source collection.</param>
        /// <param name="leaveOpen">True means that the <paramref name="source"/> is not disposed when this instance is disposed.</param>
        public static ReadOnlyIListView<T> AsReadonlyIListView<T>(this IReadOnlyObservableCollection<T> source, bool leaveOpen = false)
        {
            return new ReadOnlyIListView<T>(source, leaveOpen);
        }

After:

        /// <summary>
        /// Create a <see cref="ReadOnlyIListView{T}"/> from <paramref name="source"/>.
        /// </summary>
        /// <typeparam name="T">The type of the items in the collection.</typeparam>
        /// <param name="source">The source collection.</param>
        /// <param name="leaveOpen">True means that the <paramref name="source"/> is not disposed when this instance is disposed.</param>
        /// <returns>A <see cref="ReadOnlyIListView{T}"/>.</returns>
        public static ReadOnlyIListView<T> AsReadonlyIListView<T>(this IReadOnlyObservableCollection<T> source, bool leaveOpen = false)
        {
            return new ReadOnlyIListView<T>(source, leaveOpen);
        }