Query: Refactors changelog.md with Optimistic Direct Execution recommendation (#4004)

* Update changelog.md

This is a recommendation for customers if they would like to use the ODE features.

* Updated release notes for ODE

changelog.md

@@ -44,6 +44,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - [3836](https://github.com/Azure/azure-cosmos-dotnet-v3/pull/3836) Integrated cache: Adds BypassIntegratedCache to DedicatedGatewayRequestOptions
 - [3909](https://github.com/Azure/azure-cosmos-dotnet-v3/pull/3909) Query: Adds EnableOptimisticDirectExecution in QueryRequestOptions enabled by default
 
+Recommendation for customers regarding Optimistic Direct Execution:
+
+Starting Version 3.35.0, the Preview SDK enables the ODE feature by default. This can potentially cause a new type of continuation token to be generated. Such a token is not recognized by the older SDKs by design and this could result in a Malformed Continuation Token Exception. 
+If you have a scenario where tokens generated from the newer SDKs are used by an older SDK, we recommend a 2 step approach to upgrade:
+
+- Upgrade to the new SDK and disable ODE, both together as part of a single deployment. Wait for all nodes to upgrade.
+    - In order to disable ODE, set EnableOptimisticDirectExecution to false in the QueryRequestOptions. 
+- Enable ODE as part of second deployment for all nodes.
+
 ### <a name="3.35.0"/> [3.35.0](https://www.nuget.org/packages/Microsoft.Azure.Cosmos/3.35.0) - 2023-06-19
 
 #### Fixed