[Kotlin] Reserved word in enum class name is not capitalized

Description

Problem occurres after generation model from API spec containing reserved word as enum

Swagger-codegen version

❯ swagger-codegen version
3.0.47

Swagger declaration file content or url

swagger: '2.0'
info:
  version: 0.0.0
  title: Simple API
paths:
  /:
    get:
      responses:
        200:
          description: OK

definitions:

  EnumModel:
    type: object
    properties:
      return:
        type: string
        enum: [ "1", "0" ]

Command line used for generation

swagger-codegen generate -l kotlin-client -i /swagger/test-spec.yaml

Steps to reproduce

• Run tool for Model generation
• Check generated folder

Related issues/PRs

https://github.com/swagger-api/swagger-codegen/issues/9948
https://github.com/swagger-api/swagger-codegen/issues/6393

Suggest a fix/enhancement

https://github.com/swagger-api/swagger-codegen-generators/pull/1196

Generated Model

The generated result that is caused compilation error and malformed property name in javadoc section

/**
 * Simple API
 * No description provided (generated by Swagger Codegen https://github.com/swagger-api/swagger-codegen)
 *
 * OpenAPI spec version: 0.0.0
 * 
 *
 * NOTE: This class is auto generated by the swagger code generator program.
 * https://github.com/swagger-api/swagger-codegen.git
 * Do not edit the class manually.
 */
package ru.tinkoff.bpm.test


/**
 * 
 * @param `return` 
 */
data class EnumModel (

    val `return`: `return`? = null
) {
    /**
    * 
    * Values: _1,_0
    */
    enum class `return`(val value: kotlin.String){
        _1("1"),
        _0("0");
    }
}

Complilation error

Malformed javadoc

Start by running the stated swagger-codegen 3.0.47 command with the YAML reproduction and inspect the generated EnumModel. Trace the Kotlin model and enum generation entry point responsible for the reserved return name. Done means the generated Kotlin compiles and the enum name and Javadoc are valid.