Source Mailchimp: Correct url property description

[dlackty]

What

Fix wrong property description of Mailchimp source.

How

I checked the documentation of Mailchimp:

Recommended reading order

N/A

🚨 User Impact 🚨

N/A

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[marcosmarxm]

@dlackty can you correct the title of this field too?

[dlackty]

@marcosmarxm Updated & rebased!