Content updates for Fargate

[Pubs-MV]

Feedback from Tara C and Andrew

https://docs.prismacloudcompute.com/docs/compute_edition_21_04/install/install_defender/install_app_embedded_defender_fargate.html#embed-a[…]e-tasks.
It doesn't really say old tasks won't work but maybe that's supposed to be intuitive
"3.1. Creating a task definition in AWS
Create a new task definition in AWS with the output from the previous section. If you already have an existing task definition, create a new revision." That's all it says
We should have some additional language about the process for generating a new task. When it should be done, what scenarios etc. I have a customer where their task isn't working and we think it 's because they didn't generate a new task but the docs don't really state it is required

Issue #483 is also a Fargate content update request from Stephen G