Update ChartMogul destination documentation

[ldrobnik]

Proposed changes

Update the Supported event calls section:

• Change the event call type for contact details. The destination actually uses the Identify call—not Track— for contact details.
• Remove ambiguous wording. The inclusion of “and custom attributes” could imply the destination exports custom attributes from Segment, while in reality, it maps certain contact and customer details as custom attributes in ChartMogul.

Merge timing

ASAP once approved.

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