CSHARP-1223: JsonWriter does not own the TextWriter passed to the constructor so it should not call Dispose on it.

Author: rstam

src/MongoDB.Bson/IO/JsonWriter.cs

@@ -655,7 +655,6 @@ protected override void Dispose(bool disposing)
                     Close();
                 }
                 catch { } // ignore exceptions
-                _textWriter.Dispose();
             }
             base.Dispose(disposing);
         }