Add information on "unique_args" yaml property

[diana-lakatos]

Feedback from the Documentation site:

Feedback to:	https://documentation.platformos.com/developer-guide/notifications/creating-email-notification
Message:	What is the "unique_args" yaml property? It seems to exist in yaml, and would be interesting to see an example of how it can be used?
Email:	matt.jones@wysi.co.uk

[richxrich]

I believe it's only used for email notifications for sendgrid.

…

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[JJBragg]

Correct Rich! "unique_args" is a JSON string that will be sent over to SendGrid

https://docs.sendgrid.com/for-developers/sending-email/unique-arguments
"The SMTP API JSON string allows you to attach an unlimited number of unique arguments to your email up to 10,000 bytes. The arguments are used only for tracking. They can be retrieved through the Event API or the Email Activity page."