Fix XML comment

Author: bording

LibGit2Sharp/GlobalSettings.cs

@@ -131,10 +131,9 @@ internal static SmartSubtransportRegistration<T> RegisterDefaultSmartSubtranspor
 
         /// <summary>
         /// Registers a new <see cref="SmartSubtransport"/> as a custom
-        /// smart-protocol transport with libgit2.  Any Git remote with
+        /// smart-protocol transport with libgit2. Any Git remote with
         /// the scheme registered will delegate to the given transport
-        /// for all communication with the server.  use this transport to communicate
-        /// with the server This is not commonly
+        /// for all communication with the server. This is not commonly
         /// used: some callers may want to re-use an existing connection to
         /// perform fetch / push operations to a remote.
         ///