Fix feature gate name to match implementation

Author: jpbetz

keps/sig-api-machinery/4420-retry-generate-name/README.md

@@ -360,7 +360,7 @@ served by an apiserver with this feature enabled.
 ###### How can this feature be enabled / disabled in a live cluster?
 
 - [x] Feature gate (also fill in values in `kep.yaml`)
-  - Feature gate name: NameGenerationRetries
+  - Feature gate name: RetryGenerateName
   - Components depending on the feature gate: kube-apiserver
 
 

keps/sig-api-machinery/4420-retry-generate-name/kep.yaml

@@ -28,7 +28,7 @@ milestone:
 # The following PRR answers are required at alpha release
 # List the feature gate name and the components for which it must be enabled
 feature-gates:
-  - name: NameGenerationRetries
+  - name: RetryGenerateName
     components:
       - kube-apiserver
 disable-supported: true