Add migration note for kube-api-qps/burst

Signed-off-by: Stefan Büringer buringerst@vmware.com

Author: sbueringer

docs/book/src/developer/providers/migrations/v1.12-to-v1.13.md

@@ -63,6 +63,7 @@ Any feedback or contributions to improve following documentation is welcome!
 ## Suggested changes for providers
 
 - If you are developing a control plane provider with support for machines, please consider adding `spec.machineTemplate.spec.taints` (see [contract](../contracts/control-plane.md#controlplane-machines))
+- Cluster API bumped the default values of `--kube-api-qps` & `--kube-api-burst` to 100/200 in [CAPI-13317](https://github.com/kubernetes-sigs/cluster-api/pull/13317). You might want to consider doing the same.
 
 ## Removals scheduled for future releases