Add more description for disabling of rate limiter in code

Bug: b/195990840
Test: n/a
Change-Id: Ia8e577b8e6af6bbd00d3a00630077bc89e774b97
diff --git a/services/surfaceflinger/DisplayHardware/PowerAdvisor.cpp b/services/surfaceflinger/DisplayHardware/PowerAdvisor.cpp
index ea71a32..929f9dc 100644
--- a/services/surfaceflinger/DisplayHardware/PowerAdvisor.cpp
+++ b/services/surfaceflinger/DisplayHardware/PowerAdvisor.cpp
@@ -641,6 +641,7 @@
 
     mSupportsPowerHint = checkPowerHintSessionSupported();
 
+    // Currently set to 0 to disable rate limiter by default
     mAllowedActualDeviation = base::GetIntProperty<nsecs_t>("debug.sf.allowed_actual_deviation", 0);
 }