doc/rgw: pubsub capabilities reference was removed from docs

most pubsub docs were removed in
0fecbe2
however, the text removed described functionality that is only
supported bia pubsub

Signed-off-by: Yuval Lifshitz <[email protected]>

Author: yuvalif

doc/radosgw/s3-notification-compatibility.rst

@@ -13,7 +13,7 @@ Supported Destination
 ---------------------
 
 AWS supports: **SNS**, **SQS** and **Lambda** as possible destinations (AWS internal destinations). 
-Currently, we support: **HTTP/S**, **Kafka** and **AMQP**. And also support pulling and acking of events stored in Ceph (as an internal destination).
+Currently, we support: **HTTP/S**, **Kafka** and **AMQP**.
 
 We are using the **SNS** ARNs to represent the **HTTP/S**, **Kafka** and **AMQP** destinations.