<i18n dev> RFR: 8278254: Cleanup doclint warnings in java.desktop module

[Prasanta Sadhukhan]

The changes done under JDK-8278175 suppress on a per-file basis various missing comments that would otherwise trigger doclint warnings. Fixed them so as to remove the doclint:missing warnings.

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Commit messages:
 - Fix
 - 8278254: Cleanup doclint warnings in java.desktop module

Changes: https://git.openjdk.java.net/jdk/pull/7004/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7004&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8278254
  Stats: 258 lines in 19 files changed: 192 ins; 19 del; 47 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7004.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7004/head:pull/7004

PR: https://git.openjdk.java.net/jdk/pull/7004