RFR: 8278532: Fix some typos in compiler comments

[Hamlin Li]

On Fri, 10 Dec 2021 04:29:19 GMT, Jie Fu <jiefu at openjdk.org> wrote:

>> Thanks Vladimir for confirmation.
>
> Thanks @Hamlin-Li for your update.
> 
> It would be better to change the JBS title since you also fix a typo in C2 comments.

Thanks Vladimir, @DamonFool for your reviews.

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PR: https://git.openjdk.java.net/jdk/pull/6793