Fix punctuation in Android support notice

Author: denisebmsft

defender-endpoint/android-whatsnew.md

@@ -32,7 +32,7 @@ Want to experience Microsoft Defender for Endpoint? [Sign up for a free trial.](
 
 February 2025
 
-**Defender for Endpoint is ending support for Android 8, 8.1 and 9 on April 30, 2025**. Moving forward, only devices running Android 10 and later are supported.
+**Defender for Endpoint is ending support for Android 8, 8.1, and 9 on April 30, 2025**. Moving forward, only devices running Android 10 and later are supported.
 
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