Fix cipd.md docs code link.

Change-Id: I85d79b2bcbd69f9da8da25785e8a95444c7defc4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2140523
Auto-Submit: Mohamed Heikal <mheikal@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#760603}

docs/cipd.md

@@ -128,7 +128,7 @@ To create a private (Googler-only) package:
 package: chrome_internal/third_party/sample_cipd_dep
 ```
 
-For more information about the package definition spec, see [the code][3].
+For more information about the package definition spec, see [the code].
 
 > **Note:** Committing the .yaml file to the repository isn't required,
 > but it is recommended. Doing so has benefits for visibility and ease of