Add feature gate docs for NameGenerationRetries

Author: jpbetz

content/en/docs/reference/command-line-tools-reference/feature-gates/name-generation-retries.md

@@ -0,0 +1,16 @@
+---
+title: NameGenerationRetries
+content_type: feature_gate
+
+_build:
+  list: never
+  render: false
+
+stages:
+  - stage: alpha 
+    defaultValue: false
+    fromVersion: "1.30"
+
+removed: true
+---
+Create requests using generateName are retried automatically by the apiserver when the generated name conflicts with an existing resource name, up to a max limit of 7 retries.