Add more documentation to PROPERTY_CROSS_SIM

Add more documentation to PROPERTY_CROSS_SIM

Bug: 179307655
Test: build
Change-Id: Ie57214ad6a2049de4ccdf93d90571cec11338d06
diff --git a/telecomm/java/android/telecom/Call.java b/telecomm/java/android/telecom/Call.java
index 2a5ddfd..91f7cee 100755
--- a/telecomm/java/android/telecom/Call.java
+++ b/telecomm/java/android/telecom/Call.java
@@ -666,7 +666,11 @@
         public static final int PROPERTY_IS_ADHOC_CONFERENCE = 0x00002000;
 
         /**
-         * Connection is using Cross SIM Calling.
+         * Connection is using cross sim technology.
+         * <p>
+         * Indicates that the {@link Connection} is using a cross sim technology which would
+         * register IMS over internet APN of default data subscription.
+         * <p>
          */
         public static final int PROPERTY_CROSS_SIM = 0x00004000;