RFR: 8312491: Update Classfile API snippets and examples [v4]

[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

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14968/files
  - new: https://git.openjdk.org/jdk/pull/14968/files/3ccee5f7..8071164a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14968&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14968&range=02-03

  Stats: 225 lines in 2 files changed: 185 ins; 29 del; 11 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