message: docs: fix the broken link to the Redis proxy filter
diff: -In this example, we show how a [Redis filter](https://www.envoyproxy.io/docs/envoy/latest/configuration/network_filters/redis_proxy_filter) can be used with the Envoy proxy. The Envoy proxy [configuration](./envoy.yaml) includes a redis filter that routes egress requests to redis server.
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  +In this example, we show how a [Redis filter](https://www.envoyproxy.io/docs/envoy/latest/configuration/listeners/network_filters/redis_proxy_filter) can be used with the Envoy proxy. The Envoy proxy [configuration](./envoy.yaml) includes a redis filter that routes egress requests to redis server.
  # Usage
  1. `docker-compose pull`
  