Sync web site with Quarkus documentation

Author: quarkusbot

_guides/_attributes.adoc

@@ -1,7 +1,7 @@
 // Common attributes.
 // --> No blank lines (it ends the document header)
 :project-name: Quarkus
-:quarkus-version: 3.23.3
+:quarkus-version: 3.23.4
 :quarkus-platform-groupid: io.quarkus.platform
 // .
 :maven-version: 3.9.9

_guides/config-mappings.adoc

@@ -537,6 +537,7 @@ requires a spy:
 [source,java]
 ----
 @ConfigMapping(prefix = "app")
+@Unremovable
 public interface AppConfig {
     @WithDefault("app")
     String name();

_guides/vertx-reference.adoc

@@ -704,7 +704,7 @@ The `EventBus` object provides methods to:
 [source, java]
 ----
 // Case 1
-bus.sendAndForget("greeting", name)
+bus.send("greeting", name)
 // Case 2
 bus.publish("greeting", name)
 // Case 3
@@ -730,7 +730,7 @@ Read xref:./virtual-threads.adoc[the virtual thread guide] for more details.
 
 === Use codecs
 
-The https://vertx.io/docs/vertx-core/java/#event_bus[Vert.x Event Bus] uses https://vertx.io/docs/vertx-core/java/#_message_codecs[codecs] to _serialize_ and _deserialize_ message objects.
+The link:++https://vertx.io/docs/vertx-core/java/#event_bus++[Vert.x Event Bus] uses link:++https://vertx.io/docs/vertx-core/java/#_message_codecs++[codecs] to _serialize_ and _deserialize_ message objects.
 Quarkus provides a default codec for local delivery.
 This codec is automatically used for return types and message body parameters of local consumers, i.e. methods annotated with `@ConsumeEvent` where `ConsumeEvent#local() == true` (which is the default).