Removed unused class and finished doc comments

src/Couchbase.Lite/API/DI/ISslStream.cs

@@ -19,21 +19,12 @@
 // limitations under the License.
 // 
 
-using System;
 using System.IO;
 using System.Security.Cryptography.X509Certificates;
 using System.Threading.Tasks;
 
 namespace Couchbase.Lite.DI
 {
-    public sealed class SslException : Exception
-    {
-        internal SslException() : base("The server certificate was rejected")
-        {
-
-        }
-    }
-
     /// <summary>
     /// WARNING: This interface is a temporary solution to https://github.com/dotnet/corefx/issues/19783
     /// and is not meant to be permanent.  Once UWP 6.0 is out, this interface will be removed.

src/Couchbase.Lite/API/DI/Service.cs

@@ -24,6 +24,9 @@
 
 namespace Couchbase.Lite.DI
 {
+    /// <summary>
+    /// This is the entry point for registering dependency injection implementation in Couchbase Lite .NET
+    /// </summary>
     public static class Service
     {
         #region Constants

src/Couchbase.Lite/Log/Log.cs

@@ -124,6 +124,13 @@ static unsafe Log()
 
         #region Public Methods
 
+        /// <summary>
+        /// Adds a provider to accept logging messages to the Log implementation (if none are added
+        /// by the time the first log message comes then a default one will be chosen)
+        /// </summary>
+        /// <param name="provider">The provider to add</param>
+        /// <param name="keepDefault">If <c>true</c>, then the logging provider will exist along with
+        /// the default one, otherwise the default logger will also be added if applicable</param>
         public static void AddLoggerProvider(ILoggerProvider provider, bool keepDefault = false)
         {
             if (!keepDefault) {