RFR: 8325168: JShell should support Markdown comments [v6]

[Jan Lahoda]

> This is an attempt to add Markdown support in documentation comments to JShell.
> 
> It works by converting the Markdown text to HTML during the process of resolving `{@inheritDoc}` tags.

Jan Lahoda has updated the pull request incrementally with one additional commit since the last revision:

  Reflecting review comments.

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17686/files
  - new: https://git.openjdk.org/jdk/pull/17686/files/d85a2b8a..64c984d6

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17686&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17686&range=04-05

  Stats: 128 lines in 3 files changed: 21 ins; 4 del; 103 mod
  Patch: https://git.openjdk.org/jdk/pull/17686.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17686/head:pull/17686

PR: https://git.openjdk.org/jdk/pull/17686