RFR: 8298710: Fix typos in test/jdk/sun/security/tools/jarsigner/

[Jaikiran Pai]

Can I please get a review of this change which fixes some typos in the files under test/jdk/sun/security/tools/jarsigner/?

-------------

Commit messages:
 - 8298710: Fix typos in test/jdk/sun/security/tools/jarsigner/

Changes: https://git.openjdk.org/jdk/pull/11662/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11662&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298710
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11662.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11662/head:pull/11662

PR: https://git.openjdk.org/jdk/pull/11662