code: public ItemRequest<CustomField> updateEnumOption(String enumOption) {
      
          String path = String.format("/enum_options/%s", enumOption);
          return new ItemRequest<CustomField>(this, CustomField.class, path, "PUT");
      }
docs: Updates an existing enum option. Enum custom fields require at least one enabled enum option.
  
  Returns the full record of the updated enum option.
  
  @param  enumOption Globally unique identifier for the enum option.
  @return Request object