RFR: 8253148: Fix terminology in align_down comment

[Aleksey Shipilev]

On Tue, 15 Sep 2020 06:40:41 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this trivial terminology change in a comment.  This was supposed to be part of JDK-8247910, but I forgot
> to push this comment change before integrating.

Marked as reviewed by shade (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/166