add period

Author: leemthompo

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

@@ -78,7 +78,7 @@ Configure the essential agent settings in the **settings** tab:
     Agent Builder adds your custom instructions to the system prompt to define the agent's behavior. The system prompt enables core features like visualization and citations.
     :::
 1. Set the **Display name** for users.
-1. Add a **Display description** to explain the agent's purpose
+1. Add a **Display description** to explain the agent's purpose.
 
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