docs: update cost estimates for Fargate compute jobs

Author: cristofima

.github/git-commit-messages-instructions.md

@@ -435,9 +435,9 @@ Modified files (6):
 Configuration:
 - vCPU: 2, Memory: 4GB
 - Max runtime: 60 minutes
-- Spot pricing: ~$0.05/job vs $0.17/job on-demand
+- Spot pricing: ~$0.017/job (70% savings vs on-demand)
 
-Cost estimate: $3/month for 20 training jobs
+Cost estimate: ~$0.34/month for 20 training jobs (Fargate compute only)
 ```
 
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