Fix endpoint default timeout in global-properties.adoc

Fixes: #9314 

**Auto-cherry-pick to `6.3.x` & `6.2.x`**

Author: swiss-chris

src/reference/antora/modules/ROOT/pages/configuration/global-properties.adoc

@@ -76,6 +76,6 @@ spring.integration.channels.autoCreate=true
 spring.integration.channels.maxBroadcastSubscribers=0x7fffffff
 spring.integration.readOnly.headers=
 spring.integration.messagingTemplate.throwExceptionOnLateReply=true
-spring.integration.endpoints.defaultTimeout=-1
+spring.integration.endpoints.defaultTimeout=30000
 ----