docs(native): update metrics to be enabled by default

[JoshuaMoelans]

Changes made to:
https://docs.sentry.io/platforms/native/metrics/

DESCRIBE YOUR PR

We enabled metrics by default in getsentry/sentry-native#1609 (comment) as per the guidelines in https://develop.sentry.dev/sdk/telemetry/metrics/#initialization-options

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• Checked Vercel preview for correctness, including links
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Project	Deployment	Actions	Updated (UTC)
sentry-docs	Ready	Preview, Comment	Apr 1, 2026 9:27am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
develop-docs	Ignored	Preview	Apr 1, 2026 9:27am