[Swift] swift documentation: response headers and examples repeat output

Description

API Function documentation block:
headers and examples all elements are output, but it's repeated.

maybe number of elements.

Swagger-codegen version

2.3.1

Swagger declaration file content or url

Spec File:
http://petstore.swagger.io/v2/swagger.json

UserAPI.swift:

    /**
     Logs user into the system
     - GET /user/login
     - 
     - responseHeaders: [X-Rate-Limit(Int32), X-Expires-After(NSDate)]
     - responseHeaders: [X-Rate-Limit(Int32), X-Expires-After(NSDate)]
     - examples: [{contentType=application/xml, example=aeiou}, {contentType=application/json, example="aeiou"}]
     - examples: [{contentType=application/xml, example=aeiou}, {contentType=application/json, example="aeiou"}]
     
     - parameter username: (query) The user name for login 
     - parameter password: (query) The password for login in clear text 

     - returns: RequestBuilder<String> 
     */

api.mustache (swift/swift3/swift4):

      - name: {{name}}{{/authMethods}}{{#responseHeaders}}
    - responseHeaders: {{responseHeaders}}{{/responseHeaders}}{{#examples}}
    - examples: {{{examples}}}{{/examples}}{{#externalDocs}}

Command line used for generation

swagger-codegen generate \
        -i http://petstore.swagger.io/v2/swagger.json \
        -l swift4 \
        -o ./swift4-client

Start with the api.mustache templates for swift, swift3, and swift4, then generate the client using the provided petstore Swagger URL and command. Compare the generated UserAPI.swift documentation with the issue example. Done means each responseHeaders and examples entry appears once rather than being repeated.