Update documents to remove reference for assignment_lease

Signed-off-by: Vishal Powar <vishalpowar@google.com>

docs/root/intro/version_history.rst

@@ -5,12 +5,11 @@ Version history
 ================
 * dubbo_proxy: support the :ref:`Dubbo proxy filter <config_network_filters_dubbo_proxy>`.
 * event: added :ref:`loop duration and poll delay statistics <operations_performance>`.
+* eds: added support to specify max time for which endpoints can be used :ref:`gRPC filter <envoy_api_msg_ClusterLoadAssignment.Policy>`.
 * http: mitigated a race condition with the :ref:`delayed_close_timeout<envoy_api_field_config.filter.network.http_connection_manager.v2.HttpConnectionManager.delayed_close_timeout>` where it could trigger while actively flushing a pending write buffer for a downstream connection.
 * redis: added :ref:`prefix routing <envoy_api_field_config.filter.network.redis_proxy.v2.RedisProxy.prefix_routes>` to enable routing commands based on their key's prefix to different upstream.
 * redis: add support for zpopmax and zpopmin commands.
 * upstream: added :ref:`upstream_cx_pool_overflow <config_cluster_manager_cluster_stats>` for the connection pool circuit breaker.
-* assignment_lease : added support to specify max time for which endpoints can be used :ref:`gRPC filter <envoy_api_msg_ClusterLoadAssignment.Policy>`.
-* eds: added support to specify max time for which endpoints can be used :ref:`gRPC filter <envoy_api_msg_ClusterLoadAssignment.Policy>`.
 
 1.10.0 (Apr 5, 2019)
 ====================