RFR: 8287153: Whitespace typos in HeapRegion class

[Thomas Schatzl]

Hi all,

  please review this trivial? fix to change some whitespace in the `HeapRegion` class.

Testing: local compilation

Thanks,
  Thomas

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Commit messages:
 - 8287153: Whitespace typos in HeapRegion class

Changes: https://git.openjdk.java.net/jdk/pull/8838/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8838&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8287153
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8838.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8838/head:pull/8838

PR: https://git.openjdk.java.net/jdk/pull/8838