refactor: update comment in migrate.sh for clarity

Author: YukiTsuchida

scripts/migrate.sh

@@ -1,7 +1,7 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-# --- Config (edit here) ---
+# --- Config ---
 PROJECT_ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 SCRIPTS_DIR="$PROJECT_ROOT/scripts/migrate"
 BROADCAST_DIR="$PROJECT_ROOT/broadcast"