RFR: JDK-8275518: accessibility issue in Inet6Address docs

[Ludvig Janiuk]

Single-row table was being used as a hack here, a description list
seems more appropriate

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Commit messages:
 - Improve documentation accessibility

Changes: https://git.openjdk.java.net/jdk/pull/6010/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6010&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275518
  Stats: 7 lines in 1 file changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6010.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6010/head:pull/6010

PR: https://git.openjdk.java.net/jdk/pull/6010