Update architecture.md
Small typo correction. :)
@@ -9,7 +9,7 @@ cluster agents will pull from the Fleet manager.
## Fleet Manager
The Fleet manager is a set of Kubernetes controllers running in any standard Kubernetes
-cluster. The only API exposed by the Fleet manages is the Kubernetes API, there is no
+cluster. The only API exposed by the Fleet manager is the Kubernetes API, there is no
custom API for the fleet controller.
## Cluster Agents
