Fix grammar & typos: repair broken code fences in Python quickstart (#6709)

docs/open-source/python-quickstart.mdx

@@ -35,8 +35,7 @@ pip install mem0ai
 from mem0 import Memory
 
 m = Memory()
-
-````
+```
 </Step>
 
 <Step title="Add a memory">
@@ -46,7 +45,7 @@ messages = [
     {"role": "assistant", "content": "Hey Alex! I'll remember your interests."}
 ]
 m.add(messages, user_id="alex")
-````
+```
 
 </Step>