chor: Updated env example

Author: matvp91

config.env.example

@@ -4,8 +4,8 @@ S3_ACCESS_KEY=
 S3_SECRET_KEY=
 S3_BUCKET=
 
-# Uncomment when using docker.
-# REDIS_HOST=redis
+# With Docker, use "redis".
+REDIS_HOST=redis
 REDIS_PORT=6379
 
 # These are public, they'll end up in client JS.