RFR: 8347348: Clarify that the HTTP server in jdk.httpserver module is not a full featured server [v2]

[Jaikiran Pai]

> Can I please get a review of this doc-only change which clarifies the purpose of the HTTP server that's provided in the JDK's `jdk.httpserver` module? This should help avoid any confusion on the purpose of the server.

Jaikiran Pai has updated the pull request incrementally with one additional commit since the last revision:

  Brian's inputs

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23004/files
  - new: https://git.openjdk.org/jdk/pull/23004/files/67186675..464f6efd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23004&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23004&range=00-01

  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/23004.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23004/head:pull/23004

PR: https://git.openjdk.org/jdk/pull/23004