Remove .json from ecs fargate docs (#7472)
Remove .json from ecs fargate docs (#7472)

Remove mention of `.json` from `datadog-agent-ecs-fargate.json` as a customer mentioned using IE will download this as a gzip file, which contains the json. Removing to avoid future confusion.
DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core,DataDog/integrations-core