RFR: JDK-8278175: Enable all doclint warnings for build of java.desktop

[Joe Darcy]

In JDK 18, JDK-8189591 added the ability to suppress doclint warnings. Therefore, it is now possible to enable the full doclint checks for the java.desktop module if the instances of warnings are suppressed. This patch does this; it would be preferable to address the doc warnings directly, but that is beyond what I'm attempting to do here.

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Commit messages:
 - JDK-8278175: Enable all doclint warnings for build of java.desktop

Changes: https://git.openjdk.java.net/jdk/pull/6687/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6687&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278175
  Stats: 35 lines in 20 files changed: 16 ins; 0 del; 19 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6687.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6687/head:pull/6687

PR: https://git.openjdk.java.net/jdk/pull/6687