tweak system prompt info

Author: leemthompo

solutions/search/agent-builder/agent-builder-agents.md

@@ -67,7 +67,7 @@ Click the **New agent** button to start creating a new agent.
 Configure the essential agent settings in the **settings** tab:
 
 1. Enter an **Agent ID**, a unique identifier for reference in code.
-1. Add **Custom instructions**.<br><br>Custom instructions are appended to the system prompt that enables core agent features like visualization and citations. The custom instructions define the agent's personality and determine how it will interact with users and perform tasks.
+1. Add **Custom instructions**.<br><br>Custom instructions define the agent's personality and determine how it will interact with users and perform tasks.
 
     :::{note}
     Your custom instructions are added to the system prompt to define the agent's behavior. The system prompt enables core features like visualization and citations.