adding docs on ToFeedIterator() extention method documentation

Microsoft.Azure.Cosmos/src/Linq/CosmosLinqExtensions.cs

@@ -96,6 +96,7 @@ internal static string ToSqlQueryText<T>(this IQueryable<T> query)
 
         /// <summary>
         /// This extension method gets the FeedIterator from LINQ IQueryable to execute query asynchronously.
+        /// This will create the fresh new FeedIterator when called.
         /// </summary>
         /// <typeparam name="T">the type of object to query.</typeparam>
         /// <param name="query">the IQueryable{T} to be converted.</param>