[BUG] kotlin-spring generator doesn't generate comments on api methods

Created by: rainmanhhh

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

kotlin-spring generator doesn't generate comments on api methods(but java spring generator does)

openapi-generator version

5.0.0

OpenAPI declaration file content or url

openapi: 3.0.3
info:
  title: TRTC
  description: TRTC
  version: 1.0.0
  contact:
    name: sfy
servers:
  - url: 'http://localhost:8080'
paths:
  '/userSignature/{userId}':
    get:
      summary: generate signature for user
      tags:
        - TRTC
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                type: string
      operationId: get-userSignature
      description: generate signature for user with sha256
      parameters:
        - schema:
            type: string
          in: query
          name: test
          description: Test param
    parameters:
      - schema:
          type: string
        name: userId
        in: path
        description: id of user
        required: true
tags:
  - name: TRTC

Generation Details

config.yaml:

apiPackage: trtc.apis
artifactId: trtc-server-api
basePackage: trtc
bigDecimalAsString: true
booleanGetterPrefix: true
configPackage: trtc.config
dateLibrary: java8
ensureUniqueParams: false
groupId: trtc
hideGenerationTimestamp: true
interfaceOnly: false
modelPackage: trtc.models
serviceInterface: true
title: trtc-server-api
unhandledException: true
useTags: true

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