RFR: 8251496: Fix doclint warnings in jdk.net.httpserver

[Patrick Concannon]

Hi,

Could someone please review my doc-only fix for JDK-8251496 - ‘Fix doclint warnings in jdk.net.httpserver’ ?

This fix addresses the warnings generated by `javadoc -Xdoclint` due to missing/incomplete API documentation for
several classes within `jdk.net.httpserver`.

Kind regards,
Patrick

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Commit messages:
 - 8251496: Fix doclint warnings in jdk.net.httpserver

Changes: https://git.openjdk.java.net/jdk/pull/81/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=81&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8251496
  Stats: 332 lines in 14 files changed: 294 ins; 18 del; 20 mod
  Patch: https://git.openjdk.java.net/jdk/pull/81.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/81/head:pull/81

PR: https://git.openjdk.java.net/jdk/pull/81