RFR: Cleanup contractions

[Jesper Wilhelmsson]

On Thu, 28 Jan 2021 21:49:35 GMT, Jesper Wilhelmsson <jwilhelm at openjdk.org> wrote:

> An attempt to unify the language in the guide with regards to contractions. There was a (very brief) discussion on this on the mailing list: https://mail.openjdk.java.net/pipermail/guide-dev/2020-December/000444.html
> 
> is not --> isn't
> do not --> don't
> are not --> aren't
> etc

> My understanding is the same as Phil's; in more formal writing it is
> preferable to write the non-contracted words out.

Yes, this is the same understanding as expressed in the mail thread. The question however seems to be if this guide is formal writing or not.

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PR: https://git.openjdk.java.net/guide/pull/42