RFR: 8253475: Javadoc clean up in HttpExchange and HttpServer [v3]

[Patrick Concannon]

> Hi,
> 
> Could someone please review my doc-only fix for JDK-8253475 - 'Javadoc clean up in HttpExchange and HttpServer' ?
> 
> This fix is set of formatting changes intended to clean up the javadoc of the following classes :
> 
> `com.sun.net.httpserver.HttpExchange`
> `com.sun.net.httpserver.HttpServer`
> 
> This issue is a sub-task of [JDK-8252822](https://bugs.openjdk.java.net/browse/JDK-8252822)
> 
> Kind regards,
> Patrick

Patrick Concannon has updated the pull request with a new target base due to a merge or a rebase. The incremental
webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits
since the last revision:

 - Merge remote-tracking branch 'origin/master' into JDK-8253475
 - 8253475: Fixed typo and bad link in HttpExchange
 - Merge remote-tracking branch 'origin/master' into JDK-8253475
 - 8253475: Javadoc clean up in HttpExchange and HttpServer

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/506/files
  - new: https://git.openjdk.java.net/jdk/pull/506/files/3b4546ef..a3eab0e6

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=506&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=506&range=01-02

  Stats: 111 lines in 9 files changed: 56 ins; 36 del; 19 mod
  Patch: https://git.openjdk.java.net/jdk/pull/506.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/506/head:pull/506

PR: https://git.openjdk.java.net/jdk/pull/506