Update chart-types.mdx

[joandiazcapell]

Removed from billboard's tips the part about using thresholds and COMPARE WITH clause as nowadays this two can work together

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• What problems does this PR solve?
  Current documentation was old and this behaviour is not longer happening.
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  Here is an example of the clause COMPARE WITH working together with threshold feature on a billboard.
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[rhetoric101]

@joandiazcapell thanks for making this correction!