MINOR: Fix typos introduced in KIP-559 (#8042)

A few references to KIP-559 in the schema definitions needed to be fixed.

Reviewers: Brajesh Kumar <bristy@users.noreply.github.com>, Ron Dagostino <rdagostino@confluent.io>, Jason Gustafson <jason@confluent.io>

clients/src/main/resources/common/message/JoinGroupResponse.json

@@ -30,7 +30,7 @@
   //
   // Version 6 is the first flexible version.
   //
-  // Starting from version 7, the broker sends back the Protocol Type to the client (KIP-599).
+  // Starting from version 7, the broker sends back the Protocol Type to the client (KIP-559).
   "validVersions": "0-7",
   "flexibleVersions": "6+",
   "fields": [

clients/src/main/resources/common/message/SyncGroupRequest.json

@@ -24,7 +24,7 @@
   // Version 4 is the first flexible version.
   //
   // Starting from version 5, the client sends the Protocol Type and the Protocol Name
-  // to the broker (KIP-599). The broker will reject the request if they are inconsistent
+  // to the broker (KIP-559). The broker will reject the request if they are inconsistent
   // with the Type and Name known by the broker.
   "validVersions": "0-5",
   "flexibleVersions": "4+",

clients/src/main/resources/common/message/SyncGroupResponse.json

@@ -26,7 +26,7 @@
   // Version 4 is the first flexible version.
   //
   // Starting from version 5, the broker sends back the Protocol Type and the Protocol Name
-  // to the client (KIP-599).
+  // to the client (KIP-559).
   "validVersions": "0-5",
   "flexibleVersions": "4+",
   "fields": [