docs(dotnet): update logs docs to .NET SDK v6

[Flash0ver]

DESCRIBE YOUR PR

Update the name of a property that was changes for the Sentry for .NET SDK 6.0.0.
Additionally, two other changes to sync with the phrasing for metrics: see #16054

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  Thanks in advance for your help!

PRE-MERGE CHECKLIST

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Project	Deployment	Review	Updated (UTC)
develop-docs	Ready	Preview, Comment	Jan 16, 2026 10:14pm
sentry-docs	Error		Jan 16, 2026 10:14pm