RFR: 8346690: Shenandoah: Fix log message for end of GC usage report

[Y. Srinivas Ramakrishna]

On Thu, 19 Dec 2024 23:48:26 GMT, William Kemper <wkemper at openjdk.org> wrote:

> At the end of a cycle, the non-generational mode usage report has an errant reference to 'generation':
> 
> GC(1) At end of GC: generation used: 835M ...
> 
> After this change, the message is:
> 
> GC(0) At end of GC: used: 1793K ...
> 
> 
> The message is unchanged for the generational mode:
> 
> GC(0) At end of Concurrent Global GC: Young generation used: 1544K ...
> GC(0) At end of Concurrent Global GC: Old generation used: 0B ...

Marked as reviewed by ysr (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/22839#pullrequestreview-2516551704