Update telemetry.md

[lilyjazz]

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[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• TomShawn

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[TomShawn]

@leiysky PTAL, thanks!

[TomShawn]

/cc @leiysky

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@TomShawn: GitHub didn't allow me to request PR reviews from the following users: leiysky.

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[leiysky]

@lilyjazz I thought the description about builtin function usage has been introduced in #6731.

[TomShawn]

@lilyjazz I thought the description about builtin function usage has been introduced in #6731.

@lilyjazz Shall we close this PR?

[lilyjazz]

@lilyjazz I thought the description about builtin function usage has been introduced in #6731.

ok, I agree with you.