fix bookmaker bot

Drawing image subsets too many times
causes fiddle to fail where it used
to succeed. Reduce the number of draws
for now to work around this.

TBR=jcgregorio@google.com
NOTRY=true
Docs-Preview: https://skia.org/?cl=143100
Bug: skia:8180
Change-Id: I2610dc7575ed0e6eec1ee3c88e1f9ccc7b6a716e
Reviewed-on: https://skia-review.googlesource.com/143100
Commit-Queue: Cary Clark <caryclark@skia.org>
Auto-Submit: Cary Clark <caryclark@skia.org>
Reviewed-by: Cary Clark <caryclark@skia.org>
diff --git a/docs/SkImage_Reference.bmh b/docs/SkImage_Reference.bmh
index d3f71ac..39cc4aa 100644
--- a/docs/SkImage_Reference.bmh
+++ b/docs/SkImage_Reference.bmh
@@ -1758,8 +1758,8 @@
 #Example
 #Image 3
     canvas->scale(.5f, .5f);
-    const int width = 32;
-    const int height = 32;
+    const int width = 64;
+    const int height = 64;
     for (int y = 0; y < 512; y += height ) {
         for (int x = 0; x < 512; x += width ) {
             sk_sp<SkImage> subset(image->makeSubset({x, y, x + width, y + height}));