Improve JSDoc comments in @rtk-query/codegen-openapi

[issy]

I wasn't that happy with the way the default values for fields in the codegen types rendered in my IDE. After some small tweaks to the JSDoc comments, it looks much better.

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After:

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[issy]

@aryaemami59 since it's approved, could I get a merge?

[markerikson]

Thanks!