RFR: 8265612: revise the help info for jmap histo command [v3]

[Lin Zang]

On Wed, 5 May 2021 08:16:38 GMT, Serguei Spitsyn <sspitsyn at openjdk.org> wrote:

>> Lin Zang has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   fix indentation issue
>
> Hi Lin,
> It looks good to me. Sorry for being late on this review.
> Thanks,
> serguei

Dear @sspitsyn @plummercj 
Thanks a lot for your help reviewing. May I ask your help to push it?

BRs,
Lin

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PR: https://git.openjdk.java.net/jdk/pull/3598