Android: Update binary size alert doc

Update URL to point to the same graph as the actual text and include
num_points in example to help focus on CL in question.

Bug: None
Change-Id: I38ba2c922ae0f810f475075aafd0bf62670d35d9
Reviewed-on: https://chromium-review.googlesource.com/537474
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#480451}
1 file changed