Helm: add globalConfigurationCustomName parameter

 Fix documentation in values.yaml (nginx#6679)

charts/nginx-ingress/values.yaml

@@ -396,7 +396,7 @@ controller:
     create: false
 
     ## customName: "the-namespace/the-name-of-the-global-configuration-custom-resource"
-    ## The name of the GlobalConfiguration custom resource to use instead of the one provided by default when create is set to false.
+    ## The name of the GlobalConfiguration custom resource to use instead of the one provided by default.
 
     ## The spec of the GlobalConfiguration for defining the global configuration parameters of the Ingress Controller.
     spec: {} ## Ensure both curly brackets are removed when adding listeners in YAML format.