RFR: 8270837: fix typos in test TestSigParse.java

[Harold Seigel]

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

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Commit messages:
 - 8270837: fix typos in test TestSigParse.java

Changes: https://git.openjdk.java.net/jdk/pull/4812/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4812&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270837
  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4812.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4812/head:pull/4812

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