docs: fix search method return value handling in integration and example docs (#3208)

docs/integrations/google-ai-adk.mdx

@@ -49,8 +49,8 @@ mem0 = MemoryClient()
 def search_memory(query: str, user_id: str) -> dict:
     """Search through past conversations and memories"""
     memories = mem0.search(query, user_id=user_id)
-    if memories:
-        memory_context = "\n".join([f"- {mem['memory']}" for mem in memories])
+    if memories.get('results', []):
+        memory_context = "\n".join([f"- {mem['memory']}" for mem in memories.get('results', [])])
         return {"status": "success", "memories": memory_context}
     return {"status": "no_memories", "message": "No relevant memories found"}