[docs] update link to gpu builder

Bug: 988833
Change-Id: I8175e1b3f3627db1a8419fbabe570e5c6f3978b0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1760828
Commit-Queue: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688275}

docs/gpu/gpu_testing_bot_details.md

@@ -27,11 +27,11 @@ waterfalls, and various tryservers, as described in [Using the GPU Bots].
 All of the physical hardware for the bots lives in the Swarming pool, and most
 of it in the Chrome-GPU Swarming pool. The waterfall bots are simply virtual
 machines which spawn Swarming tasks with the appropriate tags to get them to run
-on the desired GPU and operating system type. So, for example, the [Win10
+on the desired GPU and operating system type. So, for example, the [Win10 x64
 Release (NVIDIA)] bot is actually a virtual machine which spawns all of its jobs
 with the Swarming parameters:
 
-[Win10 Release (NVIDIA)]: https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Win10%20Release%20%28NVIDIA%29
+[Win10 x64 Release (NVIDIA)]: https://ci.chromium.org/p/chromium/builders/ci/Win10%20x64%20Release%20%28NVIDIA%29
 
 ```json
 {