RFR: 8327173: HotSpot Style Guide needs update regarding nullptr vs NULL [v2]

[Kim Barrett]

> Please review this change to update the HotSpot Style Guide's discussion of
> nullptr and its use.
> 
> I suggest this is an editorial rather than substantive change to the style
> guide.  As such, the normal HotSpot PR process can be used for this change.

Kim Barrett has updated the pull request incrementally with one additional commit since the last revision:

  respond to shipilev comments

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/18101/files
  - new: https://git.openjdk.org/jdk/pull/18101/files/fdfcdc58..13dc01ac

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=18101&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18101&range=00-01

  Stats: 17 lines in 2 files changed: 0 ins; 5 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/18101.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18101/head:pull/18101

PR: https://git.openjdk.org/jdk/pull/18101