docs(roadmap): fix bash syntax in rate limit redis snippet

- Removed unnecessary backslashes from RATE_REDIS string definition.
- Optimized quote structure for valid JSON interpolation.

roadmap/prod-env/03-infra-stack-changes.md

@@ -139,7 +139,7 @@ fi
 if [[ "$PROFILE" != "dev" ]]; then
   if [[ "$PROFILE" == "prod" ]]; then
     RATE_POLICY="redis"
-    RATE_REDIS=',\"redis_host\":\"redis\",\"redis_port\":6379,\"redis_password\":\"'\"$REDIS_PASSWORD\"'\"'
+    RATE_REDIS=',"redis_host":"redis","redis_port":6379,"redis_password":"'"$REDIS_PASSWORD"'"'
   else
     RATE_POLICY="local"
     RATE_REDIS=""