NEWS: Add note about L4_SYM being used by default for ECMP.

Fixes: 596ea7a ("ovn-controller: Detect and use L4_SYM dp-hash if available.")
Signed-off-by: Dumitru Ceara <dceara@redhat.com>
Acked-by: Han Zhou <hzhou@ovn.org>
Signed-off-by: Mark Michelson <mmichels@redhat.com>

NEWS

@@ -10,6 +10,10 @@ Post v23.06.0
   - To allow optimizing ovn-controller's monitor conditions for the regular
     VIF case, ovn-controller now unconditionally monitors all sub-ports
     (ports with parent_port set).
+  - ECMP routes use L4_SYM dp-hash by default if the datapath supports it.
+    Existing sessions might get re-hashed to a different ECMP path when
+    OVN detects the algorithm support in the datapath during an upgrade
+    or restart of ovn-controller.
 
 OVN v23.06.0 - 01 Jun 2023
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