Added a few missing doc comments (found by checking the SandCastle Help File Builder log files).

Author: rstam

Driver/Core/MongoServerInstance.cs

@@ -200,6 +200,7 @@ public MongoServerState State
         /// <summary>
         /// Gets the IP end point of this server instance.
         /// </summary>
+        /// <returns>The IP end point of this server instance.</returns>
         public IPEndPoint GetIPEndPoint()
         {
             // use a lock free algorithm because DNS lookups are rare and concurrent lookups are tolerable

Driver/Linq/MongoQueryProvider.cs

@@ -61,6 +61,8 @@ public MongoCollection Collection
         /// <summary>
         /// Builds the MongoDB query that will be sent to the server when the LINQ query is executed.
         /// </summary>
+        /// <typeparam name="T">The type of the documents being queried.</typeparam>
+        /// <param name="query">The LINQ query.</param>
         /// <returns>The MongoDB query.</returns>
         public IMongoQuery BuildMongoQuery<T>(MongoQueryable<T> query)
         {