[code-reflection] RFR: Examples Improved - FMA Dialect refactored

[Juan Fumero]

- Examples Improved - FMA Dialect refactored
- README fixed 
- Documentation fixed

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Commit messages:
 - Refactor FMA Op example to use multiFilter and clean-up
 - Fix examples README and javadoc

Changes: https://git.openjdk.org/babylon/pull/570/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=570&range=00
  Stats: 63 lines in 8 files changed: 20 ins; 11 del; 32 mod
  Patch: https://git.openjdk.org/babylon/pull/570.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/570/head:pull/570

PR: https://git.openjdk.org/babylon/pull/570