docs: `integrations/platforms/microsoft` update (#22100)

Added the `Azure Container Apps dynamic sessions` tool reference

docs/docs/integrations/platforms/microsoft.mdx

@@ -271,6 +271,26 @@ See a [usage example](/docs/integrations/retrievers/azure_ai_search).
 from langchain.retrievers import AzureAISearchRetriever
 ```
 
+## Tools
+
+### Azure Container Apps dynamic sessions
+
+We need to get the `POOL_MANAGEMENT_ENDPOINT` environment variable from the Azure Container Apps service.
+See the instructions [here](https://python.langchain.com/v0.2/docs/integrations/tools/azure_dynamic_sessions/#setup).
+
+We need to install a python package.
+
+```bash
+pip install langchain-azure-dynamic-sessions
+```
+
+See a [usage example](/docs/integrations/tools/azure_dynamic_sessions).
+
+```python
+from langchain_azure_dynamic_sessions import SessionsPythonREPLTool
+```
+
+
 ## Toolkits
 
 ### Azure AI Services