move agent module guide up one-level (#10519)

Co-authored-by: Haotian Zhang <socool.king@gmail.com>

docs/index.rst

@@ -153,6 +153,7 @@ Associated projects
    module_guides/indexing/indexing.md
    module_guides/storing/storing.md
    module_guides/querying/querying.md
+   module_guides/deploying/agents/root.md
    module_guides/observability/observability.md
    module_guides/evaluating/root.md
    module_guides/supporting_modules/supporting_modules.md

docs/module_guides/deploying/agents/root.md

-# Data Agents
+# Agents
 
 ## Concept
 

docs/module_guides/querying/querying.md

 # Querying
 
-Querying is the most important part of your LLM application. To learn more about getting a final product that you can deploy, check out the [query engine](/module_guides/deploying/query_engine/root.md), [chat engine](/module_guides/deploying/chat_engines/root.md) and [agents](/module_guides/deploying/agents/root.md) sections.
+Querying is the most important part of your LLM application. To learn more about getting a final product that you can deploy, check out the [query engine](/module_guides/deploying/query_engine/root.md), [chat engine](/module_guides/deploying/chat_engines/root.md).
+
+If you wish to combine advanced reasoning with tool use, check out our [agents](/module_guides/deploying/agents/root.md) guide.
 
 ## Query Pipeline