Clarify some IpManager/ApfFilter debugging output.

Test: as follows
    - built
    - flashed
    - booted
    - "runtest frameworks-net" passes
    - "adb shell dumpsys wifi ipmanager" shows updated output
Bug: 34793131
Change-Id: I6dec135b97343943efb421ef7b2e84c4751dd5ea
(cherry picked from commit af579eb5b516296a8ec0b02d824f2ba646e60ca2)
diff --git a/services/net/java/android/net/apf/ApfCapabilities.java b/services/net/java/android/net/apf/ApfCapabilities.java
index b0e0230..703b415 100644
--- a/services/net/java/android/net/apf/ApfCapabilities.java
+++ b/services/net/java/android/net/apf/ApfCapabilities.java
@@ -46,7 +46,7 @@
     }
 
     public String toString() {
-        return String.format("%s{version: %d, maxSize: %d format: %d}", getClass().getSimpleName(),
+        return String.format("%s{version: %d, maxSize: %d, format: %d}", getClass().getSimpleName(),
                 apfVersionSupported, maximumApfProgramSize, apfPacketFormat);
     }
 }