Apply review comment

Co-authored-by: Nicole Gomes <47161082+NicoleMGomes@users.noreply.github.com>

Author: santosh-nallur

src/sap_cloud_sdk/agent_memory/factory/__init__.py

@@ -8,7 +8,7 @@
 - :func:`sap_cloud_sdk.agent_memory.factory.langgraph_checkpoint.create_checkpointer`
   — returns a LangGraph ``BaseCheckpointSaver`` (short-term memory)
 
-Usage::
+Usage:
 
     from sap_cloud_sdk.agent_memory.factory.langgraph_checkpoint import create_checkpointer
 """