Bug 1447035 - follow-up - reftest comment clarification. r=me

layout/reftests/canvas/1447035-1.html

@@ -4,11 +4,11 @@
 function fillCanvas(gradColor) {
     var c = document.getElementById(gradColor + 'Canvas');
     var ctx = c.getContext("2d");
-    // Create gradient
+    // Create solid-color gradient, with all stops same color
     var grd = ctx.createRadialGradient(75,50,5,90,60,100);
     grd.addColorStop(0,gradColor);
     grd.addColorStop(1,gradColor);
-    // Fill with gradient
+    // Fill with gradient, but effectively a solid fill
     ctx.fillStyle = grd;
     ctx.fillRect(0,0,200,100);
 }