RFR: 8270837: fix typos in test TestSigParse.java

[Kevin Rushforth]

On Fri, 16 Jul 2021 14:43:06 GMT, NikolayTach <github.com+42199859+NikolayTach at openjdk.org> wrote:

>> Please review this trivial fix for JDK-8270837.  The modified test was tested by running Mach5 tier1 on Linux, Mac OS, and Windows and by running the test locally on Linux x64.
>> 
>> Thanks, Harold
>
> [![binary license](https://img.esa.io/uploads/production/attachments/17596/2021/04/10/101590/654fbc34-593b-4224-a054-e50cac1baaea.svg)](https://www.oracle.com/downloads/licenses/binary-code-license.html)

@NikolayTach I see you have added comments to a few `openjdk` pull requests. None of them are relevant to the pull requests in question, so I presume that these comments were added in error. Please take the necessary steps to avoid adding irrelevant comments in the future.

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PR: https://git.openjdk.java.net/jdk/pull/4812