RFR: 8278254: Cleanup doclint warnings in java.desktop module [v5]

[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.

Prasanta Sadhukhan has updated the pull request incrementally with one additional commit since the last revision:

  Address review comment

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7004/files
  - new: https://git.openjdk.java.net/jdk/pull/7004/files/16d76ed3..752b7a09

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7004&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7004&range=03-04

  Stats: 7 lines in 3 files changed: 0 ins; 0 del; 7 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