Add note highlighting at least one mapping must be configured and enabled in Actions destination #4134
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Proposed changes
Customers frequently write in asking why data is not sending from an actions destination - in most cases, it's because there aren't any mappings configured/enabled to handle events. Another question that comes in related to this is when the customer tries sending a test event and is met with a Validation error that surfaces in response to a lack of a mapping to handle the event:

It isn't currently mentioned in the Destination Actions docs that at least one mapping to handle the connected source's event(s) must be configured and enabled in order for data to reach the destination, so adding a note to highlight this should help to inform customers on what's required.
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