RFR: 8283724: Incorrect description for jtreg-failure-handler option

[KIRIYAMA Takuya]

On Thu, 9 Jun 2022 06:49:15 GMT, KIRIYAMA Takuya <duke at openjdk.java.net> wrote:

> The description for the jtreg-failure-handler option is incorrect, so I fixed it to describe jtreg-failure-handler option.  
> Would you please review this fix?

I appreciate all reviews. I hope this change is integrated.

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PR: https://git.openjdk.org/jdk/pull/9099