Modify docs to clarify EXTRA_LOG_SELF_MANAGED_CALLS behavior.

We do not post a notification when a self-managed call is missed
and we log it in the call log.

Bug: 62999358
Test: Manual
Change-Id: I0ae851e6fa17fbd3b7591b01745956feef4c57fd

telecomm/java/android/telecom/PhoneAccount.java

@@ -127,6 +127,8 @@ public final class PhoneAccount implements Parcelable {
     /**
      * Boolean {@link PhoneAccount} extras key (see {@link PhoneAccount#getExtras()}) which
      * indicates whether a Self-Managed {@link PhoneAccount} should log its calls to the call log.
+     * Self-Managed {@link PhoneAccount}s are responsible for their own notifications, so the system
+     * will not create a notification when a missed call is logged.
      * <p>
      * By default, Self-Managed {@link PhoneAccount}s do not log their calls to the call log.
      * Setting this extra to {@code true} provides a means for them to log their calls.