Correct anchor link

Author: Simran-B

docs/Manual/Deployment/Kubernetes/Drain.md

@@ -421,7 +421,7 @@ much data is stored in the pod, your mileage may vary, moving a terabyte
 of data can take considerably longer!
 
 If the optional step of
-[cleaning out a DBserver manually](#clean-out-a-dbserver-manually-optional)
+[cleaning out a DBserver manually](#clean-out-a-dbserver-manually)
 has been performed beforehand, the grace period can easily be reduced to 60
 seconds - at least from the perspective of ArangoDB, since the server is already
 cleaned out, so it can be dropped readily and there is still no risk.