RFR: 6441827: Documentation mentions nonexistent NullReferenceException [v2]

[Jaikiran Pai]

> Can I please get a review of this doc only change which fixes a trivial typo in the documentation of `ObjectOutputStream.replaceObject()` method, as noted in https://bugs.openjdk.org/browse/JDK-6441827?

Jaikiran Pai has updated the pull request incrementally with one additional commit since the last revision:

  @link instead of @code

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/13399/files
  - new: https://git.openjdk.org/jdk/pull/13399/files/97ed04fd..1bde61f2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13399&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13399&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13399.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13399/head:pull/13399

PR: https://git.openjdk.org/jdk/pull/13399