update documentation

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

src/api/dotnet/Fixedpoint.cs

@@ -305,6 +305,9 @@ namespace Microsoft.Z3
             }
         }
 
+        /// <summary>
+        /// Fixedpoint statistics.
+        /// </summary>
         public Statistics Statistics
         {
             get

src/api/dotnet/Optimize.cs

@@ -155,6 +155,9 @@ namespace Microsoft.Z3
             return Native.Z3_optimize_to_string(Context.nCtx, NativeObject);
         }
 
+        /// <summary>
+        /// Optimize statistics.
+        /// </summary>
         public Statistics Statistics
         {
             get

src/api/java/Fixedpoint.java

@@ -308,6 +308,18 @@ public class Fixedpoint extends Z3Object
         return res;
     }
 
+    /**
+     * Fixedpoint statistics.
+     * 
+     * @throws Z3Exception
+     **/
+    public Statistics getStatistics() throws Z3Exception
+    {
+        return new Statistics(getContext(), Native.fixedpointGetStatistics(
+                getContext().nCtx(), getNativeObject()));
+    }
+
+
     Fixedpoint(Context ctx, long obj) throws Z3Exception
     {
         super(ctx, obj);