fix broken link in upgrade doc

Author: msukkari

docs/self-hosting/upgrade/v3-to-v4-guide.mdx

@@ -51,7 +51,7 @@ navigating to **Settings -> Members**. Emails can be sent on organization join r
 
 ### If your deployment uses multi-tenancy mode
 
-Unfortunately, multi-tenancy mode is no longer officially supported in v4. To upgrade to v4, you'll need to unset the `SOURCEBOT_TENANCY_MODE` environment variable and wipe your Sourcebot cache. You can then follow the [instructions above](/self-hosting/upgrade/v3-to-v4-guide#if-your-deployment-doesnt-have-authentication-enabled-i-e-sourcebot-auth-enabled)
+Unfortunately, multi-tenancy mode is no longer officially supported in v4. To upgrade to v4, you'll need to unset the `SOURCEBOT_TENANCY_MODE` environment variable and wipe your Sourcebot cache. You can then follow the [instructions above](/self-hosting/upgrade/v3-to-v4-guide#if-your-deployment-doesnt-have-authentication-enabled)
 to finish upgrading to v4 in single-tenant mode.
 
 ## Troubleshooting