RFR: 8253100: Fix "no comment" warnings in java.base/java.net

[Daniel Fuchs]

Hi, 

Please find here a change that fixes "no comment" warnings generated by `javadoc -Xdoclint` for `java.base/java.net`

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Commit messages:
 - Fixed trailing whitespace
 - 8253100: Fix "no comment" warnings in java.base/java.net

Changes: https://git.openjdk.java.net/jdk/pull/2715/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2715&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253100
  Stats: 129 lines in 10 files changed: 97 ins; 0 del; 32 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2715.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2715/head:pull/2715

PR: https://git.openjdk.java.net/jdk/pull/2715