RFR: 8272691: Fix HotSpot style guide terminology for "non-local variables"

[Kim Barrett]

Please review this fix to incorrect terminology used in one place.  The
correct terminology (per C++14 3.6.2) is "non-local variables".

As this is a HotSpot Style Guide change, it requires reviewers who are HotSpot
Group Members, though comments from others are welcome.

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Commit messages:
 - update html
 - fix non-local variable term

Changes: https://git.openjdk.java.net/jdk/pull/7695/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7695&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272691
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7695.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7695/head:pull/7695

PR: https://git.openjdk.java.net/jdk/pull/7695