[code-reflection] RFR: Replace the term quotable with reflectable lambda

[Paul Sandoz]

Replace the term quotable with reflectable lambda.

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Commit messages:
 - Update HAT doc.
 - Update curated list of classes.
 - Remove use of term quotable.

Changes: https://git.openjdk.org/babylon/pull/844/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=844&range=00
  Stats: 565 lines in 27 files changed: 210 ins; 222 del; 133 mod
  Patch: https://git.openjdk.org/babylon/pull/844.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/844/head:pull/844

PR: https://git.openjdk.org/babylon/pull/844