RFR: 8263978: Clarify why 0 argument is ignored in SecureRandom::setSeed [v2]

[Weijun Wang]

> We don't use `digest` anymore but still need to ignore the 0 argument.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  typo

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3124/files
  - new: https://git.openjdk.java.net/jdk/pull/3124/files/dd61f386..6bd8b100

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3124&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3124&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3124.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3124/head:pull/3124

PR: https://git.openjdk.java.net/jdk/pull/3124