[BUG] [JavaSpring] Change Dangling package JavaDoc into Regular Comment Block

[anthonyvdotbe]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator?
• 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

One of the templates incorrectly uses a Javadoc comment /** where it should use a normal comment /*. This results in a Javadoc warning during compilation, which fails the build when compiling with -Werror.

openapi-generator version

7.23.0

OpenAPI declaration file content or url

n/a

Generation Details

n/a

Steps to reproduce

n/a

Related issues/PRs

n/a

Suggest a fix

#24278