docs: improve Redis subscription documentation in config.yaml

Change comment from 'PSUBSCRIBE' to 'Subscribe/PSubscribe' to clarify
support for both Redis subscription patterns in notification sync.

Author: Mat001

config.yaml

@@ -252,6 +252,10 @@ synchronization:
             host: "redis.demo.svc:6379"
             password: ""
             database: 0
+            ## channel: "optimizely-sync"  # Base channel name (NOT currently parsed - uses hardcoded default)
+            ## Agent publishes to channels: "optimizely-sync-{sdk_key}"
+            ## For external Redis clients: Subscribe "optimizely-sync-{sdk_key}" or PSubscribe "optimizely-sync-*"
+            ## Note: Channel configuration parsing is a known bug - planned for future release
     ## if notification synchronization is enabled, then the active notification event-stream API
     ## will get the notifications from available replicas
     notification: