win_cross.md: fix the b/ link that does not work in the generated page

b/<id> link seems not working because the system recognizes it
as a relative URL. Adding http:// should work (for Googlers).

Change-Id: I6348dffa99318ab5eef0a74e20d9fc3c25b23b1c
Reviewed-on: https://chromium-review.googlesource.com/746485
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Taiju Tsuiki <tzik@chromium.org>
Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512786}
1 file changed