fixed broken link (#886)

link fix

## Pull Request approval

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docs/admin/updates/kubernetes.mdx

@@ -4,7 +4,7 @@ This page lists the changes that are relevant for upgrading Sourcegraph on **Kub
 
 For upgrade procedures or general info about sourcegraph versioning see the links below:
 - [Kubernetes Kustomize Upgrade Procedures](/admin/deploy/kubernetes/upgrade)
-- [Kubernetes Helm Upgrade Procedures](/admin/deploy/kubernetes/helm#upgrading-sourcegraph)
+- [Kubernetes Helm Upgrade Procedures](/admin/deploy/kubernetes#upgrading-sourcegraph)
 - [General Upgrade Info](/admin/updates)
 - [Technical changelog](/technical-changelog)