Update release_notes.md

Author: CharlesDuboisSAP

docs/release-notes/release_notes.md

@@ -9,7 +9,7 @@
 ### 🔧 Compatibility Notes
 
 - The constructors `UserMessage(MessageContent)` and `SystemMessage(MessageContent)` are removed. Use `Message.user(String)`, `Message.user(ImageItem)`, or `Message.system(String)` instead.
-- Add `toMap()` and deprecate `getCustomField(String)` on generated model classes.
+- Deprecate `getCustomField(String)` in favor of `toMap()` on generated model classes.
   - `com.sap.ai.sdk.core.model.*`
   - `com.sap.ai.sdk.orchestration.model.*`