Update microsoft-defender-core-service-overview.md

Author: denisebmsft

defender-endpoint/microsoft-defender-core-service-overview.md

@@ -26,7 +26,7 @@ To enhance your endpoint security experience, Microsoft is releasing the Microso
 
 1. The Microsoft Defender Core service is releasing with [Microsoft Defender Antivirus platform version 4.18.23110.2009](./msda-updates-previous-versions-technical-upgrade-support.md#october-2023-platform-418231002009--engine-11231002009).
 
-1. Rollout begins on:
+1. Rollout is planned to begin as follows:
 
    - November 2023 to prerelease customers.
    - Mid April 2024 to Enterprise customers running Windows clients.