[docs] Fix file path in blink.md

Bug: 943852
Change-Id: Ife8da01538a82dfb7aebca3d6a1264c94ecabf73
No-Try: true
Docs-Preview: https://skia.org/?cl=291845
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/291845
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
1 file changed