RFR: 8276982: VM.class_hierarchy jcmd help output and man page text needs clarifications/improvements

[Chris Plummer]

Clarify the help output for VM.class_hierarchy. The old jcmd help output was misleading, and because of this got translated incorrectly for the man page.

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Commit messages:
 - Fix VM.class_hierarchy help output and man page.

Changes: https://git.openjdk.java.net/jdk/pull/6845/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6845&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276982
  Stats: 6 lines in 2 files changed: 1 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6845.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6845/head:pull/6845

PR: https://git.openjdk.java.net/jdk/pull/6845