improvement(pii): clarify custom regex replacement placeholder (#5975) #23727

Job	Run time
Build AMD64 (./docker/app.Dockerfile, ghcr.io/simstudioai/simstudio, ECR_APP, linux-x64-8-core, b...	7m 42s
Detect Version	5s
Build AMD64 (./docker/pii.Dockerfile, ghcr.io/simstudioai/pii, ECR_PII, ubuntu-latest, blacksmith...	33s
Build AMD64 (./docker/realtime.Dockerfile, ghcr.io/simstudioai/realtime, ECR_REALTIME, ubuntu-lat...	1m 15s
Test and Build / Build App	4m 18s
Build AMD64 (./docker/db.Dockerfile, ghcr.io/simstudioai/migrations, ECR_MIGRATIONS, ubuntu-lates...	1m 28s
Test and Build / Lint and Test	3m 45s
Migrate Dev DB	-1s
Check Docs Changes	-1s
Build ARM64 (GHCR Only)	-1s
Deploy Trigger.dev (Dev)	0s
Build Dev ECR	0s
Migrate DB / Apply Database Migrations	41s
Promote Images	23s
Process Docs	0s
Create GHCR Manifests	0s
Create GitHub Release	0s
	20m 7s

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