[TYPO] [Java] Comment in webclient ApiClient.mustache refers to RestTemplate

Created by: dtiller

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?
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Description

A comment in webclient ApiClient.mustache refers to RestTemplate.

openapi-generator version

5.0.0-beta2

Steps to reproduce

See lines 146-149 in the webclient ApiClient.mustache template

 /**
    * Build the RestTemplate used to make HTTP requests.
    * @return RestTemplate
    */
public static WebClient buildWebClient(ObjectMapper mapper) {
...
}

Related issues/PRs

None that I found.

Suggest a fix

 /**
    * Build the WebClient used to make HTTP requests.
    * @return WebClient
    */
public static WebClient buildWebClient(ObjectMapper mapper) {
...
}