[jdk11u-dev] RFR: 8210395: Add doc to SecurityTools.java

[Christoph Langer]

Backport of JDK-8210395. Minor resolving required, import java.util.Arrays; has to be kept.

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Commit messages:
 - Backport 5cf91fc60e90bf03e113966760666adaf6d65798

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/315/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=315&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8210395
  Stats: 78 lines in 2 files changed: 70 ins; 0 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/315.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/315/head:pull/315

PR: https://git.openjdk.java.net/jdk11u-dev/pull/315