RFR: 8328318: Wrong description in X509Extension.getExtensionValue method javadoc [v2]

[Ben Perez]

> Removed `PrivateKeyUsagePeriod` from method javadoc and added several commonly used extensions

Ben Perez has updated the pull request incrementally with one additional commit since the last revision:

  Updated copyright

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Changes:
  - all: https://git.openjdk.org/jdk/pull/18565/files
  - new: https://git.openjdk.org/jdk/pull/18565/files/b4def292..272d1663

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18565&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18565&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/18565.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18565/head:pull/18565

PR: https://git.openjdk.org/jdk/pull/18565