Update _posts/2025-07-09-quarkus-and-a2a-java-sdk.adoc

Co-authored-by: Clement Escoffier <[email protected]>

Author: fjuma

_posts/2025-07-09-quarkus-and-a2a-java-sdk.adoc

@@ -16,7 +16,7 @@ You can also check out our https://www.youtube.com/watch?v=5CZzW-wvEQs[short vid
 
 Before jumping into the details, let's go through what https://a2aproject.github.io/A2A/specification/[A2A] is. The _Agent2Agent_ (A2A) protocol is an open standard developed by Google. It enables AI agents to communicate and collaborate with one another, regardless of each agent's underlying framework, language, or vendor. This is important, as it paves the way for polyglot multi-agent systems.
 
-=== Important Concepts
+=== Main Concepts
 
 The A2A protocol involves a few important concepts: