RFR: 8377914: Typos in HKDFParameterSpec.Builder::thenExpand

[Bradford Wetmore]

Fixed three incorrect javadoc directives, and shortened a few long lines.

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Commit messages:
 - 8377914: Typos in HKDFParameterSpec.Builder::thenExpand

Changes: https://git.openjdk.org/jdk/pull/29887/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=29887&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8377914
  Stats: 11 lines in 1 file changed: 3 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/29887.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29887/head:pull/29887

PR: https://git.openjdk.org/jdk/pull/29887