Fix typo in user guide
@@ -79,7 +79,7 @@ mgr, err := manager.New(cfg, manager.Options{Namespace: ""})
## Add a new Custom Resource Definition
-Add a new Custom Resource Definition(CRD) API called Memcached, with APIVersion `cache.example.com/v1apha1` and Kind `Memcached`.
+Add a new Custom Resource Definition(CRD) API called Memcached, with APIVersion `cache.example.com/v1alpha1` and Kind `Memcached`.
```sh
$ operator-sdk add api --api-version=cache.example.com/v1alpha1 --kind=Memcached
