Fix alignment of 'ClusterClass' in docs

Signed-off-by: killianmuldoon <[email protected]>

Author: killianmuldoon

docs/book/src/developer/architecture/controllers.md

@@ -14,7 +14,7 @@ Documentation for the CAPI controllers can be found at:
   - [MachineDeployment](./controllers/machine-deployment.md)
   - [MachineHealthCheck](./controllers/machine-health-check.md)
   - [MachinePool](./controllers/machine-pool.md)
- - ClusterClass
+- ClusterClass
   - [Cluster Topology](./controllers/cluster-topology.md)
 - AddOns
    - [ClusterResourceSet](./controllers/cluster-resource-set.md)