doc: fix unclosed link syntax

[unknwon]

Test plan

n/a

[github-actions]

❌ Problem: the label i-acknowledge-this-goes-into-the-release is absent.
👉 What to do: we're in the next Sourcegraph release code freeze period. If you are 100% sure your changes should get released or provide no risk to the release, add the label your PR with i-acknowledge-this-goes-into-the-release.
❓ When does the freeze end? The code freeze is active until 2023-02-22 at 23:59 UTC.

[BolajiOlajide]

Thank you!