RFR: 8265961: Fix comments in logging.properties

[Pavel Rappo]

I had been looking for an example of a "properties" file when spotted a typo in `logging.properties`. I decided to proofread the file. That resulted in finding a few other issues.

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Commit messages:
 - Initial commit

Changes: https://git.openjdk.java.net/jdk/pull/3688/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3688&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8265961
  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3688.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3688/head:pull/3688

PR: https://git.openjdk.java.net/jdk/pull/3688