RFR: 8298709: Fix typos in src/java.desktop/ and various test classes of client component

[Jaikiran Pai]

Can I please get a review for this change which only fixes typos? The original PR for this change is https://github.com/openjdk/jdk/pull/10029. However, that PR included changes to multiple different files in different areas of the JDK and as a result didn't see progress.

This current PR splits off those changes and includes only client area related typo fixes.

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Commit messages:
 - 8298709: Fix typos in src/java.desktop/ and various test classes of client component

Changes: https://git.openjdk.org/jdk/pull/11661/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11661&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298709
  Stats: 19 lines in 16 files changed: 0 ins; 0 del; 19 mod
  Patch: https://git.openjdk.org/jdk/pull/11661.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11661/head:pull/11661

PR: https://git.openjdk.org/jdk/pull/11661