RFR: 7903067: JMH: Improve English grammar in error messages [v2]

[Aarre Laakso]

On Tue, 30 Nov 2021 09:29:45 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

>> Aarre Laakso has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Revert irrelevant change to .gitignore
>
> .gitignore line 3:
> 
>> 1: *.iml
>> 2: target/
>> 3: .idea/
> 
> This change is irrelevant, let's revert it.

I have changed the PR title and reverted the change to .gitignore

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PR: https://git.openjdk.java.net/jmh/pull/56