fix wrong JDK version for record introduction of enums article #138
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As reported in #137, the article about enums (#45) states the wrong JDK version for the introduction of records.
This PR changes it to JDK 16 which is when Records have been introduced:

I haven't included the version when records have been introduced as a Preview feature since I think most people reading the article about enums are probably not interested in the exact history of records, they probably only want to know when they can use it.
fixes #137