RFR: 8285517: System.getenv() returns unexpected value if environment variable has non ASCII character [v9]

[Ichiroh Takiguchi]

On Tue, 26 Apr 2022 21:17:34 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> Ichiroh Takiguchi has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8285517: System.getenv() returns unexpected value if environment variable has non ASCII character
>
> Thanks for fixing the issue.
> As to the test, it has lots of redundancy, and too complicated to me. Can you simplify the test?

Hello @naotoj .
To keep consistency, I modified other javadoc texts on `StaticProperty.java`.
And fix javdoc tag error.

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PR: https://git.openjdk.java.net/jdk/pull/8378