fix(config): update tracing section headers in example TOML files

[waynexia]

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What's changed and what's your intention?

Fix UT under cargo nextest run --all-features.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

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[waynexia]

After discussing with @evenyag, some features are not available in some targets. We have to solve this before adding --all-features in CI

[killme2008]

LGTM