Update readme.md

Author: acoumb

src/Umbraco.Cms.Integrations.Crm.ActiveCampaign/readme.md

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 # Umbraco.Cms.Integrations.Crm.ActiveCampaign
 
-This integration provides a form picker and rendering component for forms managed withing a Microsoft Dynamics 365 Marketing instance.
+This integration provides a form picker and rendering component for forms managed within an ActiveCampaign CRM account.
 
 ## Prerequisites