RFR: 8282523: Fix 'hierachy' typo

[Andrey Turbanov]

Fix multiple 'hierachy' -> 'hierarchy' typos

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Commit messages:
 - [PATCH] Fix multiple 'hierachy' -> 'hierarchy' typos

Changes: https://git.openjdk.java.net/jdk/pull/7474/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7474&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282523
  Stats: 20 lines in 5 files changed: 0 ins; 0 del; 20 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7474.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7474/head:pull/7474

PR: https://git.openjdk.java.net/jdk/pull/7474