svc: Fix comment in svc screen datarate test

Change-Id: I5e008599dd22efb865b2376e8296676a640e6d06
diff --git a/test/svc_datarate_test.cc b/test/svc_datarate_test.cc
index 1836f7c..a5c3840 100644
--- a/test/svc_datarate_test.cc
+++ b/test/svc_datarate_test.cc
@@ -670,8 +670,8 @@
     // mismatch count, since loopfilter/cdef is not applied for these on
     // encoder side, but is always applied on decoder.
     // This means 30 = #frames(60) - #TL2_frames(30).
-    // We use LE for screen since loopfilter level can become very
-    // or zero and then frame is not a mismatch.
+    // We use LE for screen since loopfilter level can become very small
+    // or zero and then the frame is not a mismatch.
     EXPECT_LE((int)GetMismatchFrames(), 30);
   }