[Settings] Fine tune log output and code comments

Adjusted log output and code comments.

Bug: 195090132
Bug: 195091953
Test: local
Change-Id: I37ccd641c313e1ffafa600fffe7ca7eaf287db88

src/com/android/settings/network/helper/SubscriptionAnnotation.java

@@ -160,7 +160,7 @@ public class SubscriptionAnnotation {
 
     public String toString() {
         return TAG + "{" + "subId=" + getSubscriptionId()
-                + ",type=" + getType()
+                + ",type=" + getType() + ",exist=" + isExisted()
                 + ",active=" + isActive() + ",displayAllow=" + isDisplayAllowed()
                 + "}";
     }

src/com/android/settings/network/helper/SubscriptionGrouping.java

@@ -93,7 +93,7 @@ public class SubscriptionGrouping
         annoSelector = annoSelector
                 // eSIM in front of pSIM
                 .thenComparingInt(anno -> -anno.getType())
-                // maintain the ordering within from list given
+                // maintain the ordering given within constructor
                 .thenComparingInt(anno -> annoList.indexOf(anno));
         return annoList.stream().sorted(annoSelector).findFirst().orElse(null);
     }