Align the specification of `Unsafe.allocateMemory` with its implementation and with the specification of `Unsafe.reallocateMemory`.
------------- Commit messages: - 8324960: Unsafe.allocateMemory documentation incorrect regarding zero return value Changes: https://git.openjdk.org/jdk/pull/17643/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=17643&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8324960 Stats: 10 lines in 2 files changed: 2 ins; 0 del; 8 mod Patch: https://git.openjdk.org/jdk/pull/17643.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/17643/head:pull/17643 PR: https://git.openjdk.org/jdk/pull/17643
