Add the following information in the documentation regarding the limit of Redis connections in backend components:

When running in Async (the default) mode, backend-listener, backend-worker and backend-cron limit the number of connections that a single Redis client can establish to the Redis server. Each pod creates two clients - one for each Redis database (storage and queues). The default is 10 connections per client, which can be overriden by setting the environment variables CONFIG_REDIS_MAX_CONNS and CONFIG_QUEUES_MAX_CONNS to the value of desired maximum connections, for storage Redis and queues Redis respectively.