Fix the example errors caused by (#1022).

src/TensorFlowNET.Core/Util/ProtoUtils.cs

@@ -10,7 +10,7 @@ namespace Tensorflow.Util
         {
             return valueCase switch
             {
-                AttrValue.ValueOneofCase.S => value.S,
+                AttrValue.ValueOneofCase.S => value.S.ToStringUtf8(),
                 AttrValue.ValueOneofCase.I => value.I,
                 AttrValue.ValueOneofCase.F => value.F,
                 AttrValue.ValueOneofCase.B => value.B,

src/TensorFlowNET.Core/Variables/ResourceVariable.cs

@@ -174,7 +174,7 @@ namespace Tensorflow
 
                     base.__init__(trainable: trainable,
                         shape: shape,
-                        dtype: dtype,
+                        dtype: _dtype,
                         handle: handle,
                         name: name,
                         unique_id: unique_id,