comment fix

Author: thatfiredev

admob/app/src/main/AndroidManifest.xml

@@ -9,7 +9,7 @@
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
 
-        // workaround for https://github.com/firebase/firebase-cpp-sdk/issues/1545
+        <!-- workaround for https://github.com/firebase/firebase-cpp-sdk/issues/1545 -->
         <property
             android:name="android.adservices.AD_SERVICES_CONFIG"
             android:resource="@xml/gma_ad_services_config"