RFR: 8368212: ZGC: Fix spelling and typos in comments

[Stefan Karlsson]

On Mon, 22 Sep 2025 05:59:03 GMT, Axel Boldt-Christmas <aboldtch at openjdk.org> wrote:

> Trivial fix of a hand full of comments which have typos or miss-spellings. Only fix obvious miss-spellings, not American vs British vs colloquial inconsistencies, nor englishified jargon.

Marked as reviewed by stefank (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/27416#pullrequestreview-3250940514