RFR: 8312491: Update Classfile API snippets and examples [v2]

[Adam Sotona]

> 8312491: Update Classfile API snippets and examples

Adam Sotona has updated the pull request incrementally with one additional commit since the last revision:

  fixing javadoc

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14968/files
  - new: https://git.openjdk.org/jdk/pull/14968/files/a81d1829..9d94af19

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14968&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14968&range=00-01

  Stats: 499 lines in 24 files changed: 495 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/14968.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14968/head:pull/14968

PR: https://git.openjdk.org/jdk/pull/14968