docs: update docs with event observer changes

docs/event-dispatcher.md

@@ -464,8 +464,7 @@ Example:
 This payload includes data related to a single mutation to a StackerDB replica
 that this node subscribes to.  The data will only get sent here if the
 corresponding chunk has already been successfully stored.  The data includes the
-chunk ID, chunk version, smart contract ID, signature, and data hash; the
-consumer may request the chunk data itself with a follow-up GET request on the node.
+chunk ID, chunk version, smart contract ID, signature, and data.
 
 This endpoint broadcasts events to `AnyEvent` observers, as well as to
 `StackerDBChunks` observers.
@@ -477,10 +476,10 @@ Example:
    "contract_id": "STVN97YYA10MY5F6KQJHKNYJNM24C4A1AT39WRW.hello-world",
    "modified_slots": [
       {
-         "slot_id": 0,
-         "slot_version": 20,
-         "data_hash": "9d26b8009ab4693d3792791a4ea5e338822b5631af94e567a485b7265ba0f107",
-         "signature": "015814daf929d8700af344987681f44e913890a12e38550abe8e40f149ef5269f40f4008083a0f2e0ddf65dcd05ecfc151c7ff8a5308ad04c77c0e87b5aeadad31"
+         "slot_id": 4,
+         "slot_version": 1,
+         "signature": "0073feb0a3b8794c95042ac23734eb0db226049665a52a4f7402499256c83d43dd4edf6eb2cb039d7f204b4c4076afde96aca143ea285ff40f10ed68cc6e5fcbc2",
+         "data": "68656c6c6f20776f726c64"
       }
    ]
 }