RFR: 8278254: Cleanup doclint warnings in java.desktop module [v2]

[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:

  review fix

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7004/files
  - new: https://git.openjdk.java.net/jdk/pull/7004/files/97d0232a..765c4147

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7004&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7004&range=00-01

  Stats: 43 lines in 7 files changed: 12 ins; 0 del; 31 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