style(docs): improve code formatting in features demo

Clean up whitespace and improve readability in v0_4_3b2_features_demo.py:
- Remove excessive blank lines between functions
- Improve config formatting for better readability
- Uncomment memory dispatcher demo in main function

No breaking changes.

docs/examples/v0_4_3b2_features_demo.py

@@ -95,7 +95,6 @@ async def demo_memory_dispatcher():
     except Exception as e:
         print(f"\n❌ Error in memory dispatcher demo: {str(e)}")
 
-
 async def demo_streaming_support():
     """
     2. Streaming Support Demo
@@ -127,7 +126,6 @@ async def demo_streaming_support():
             if result.success:
                 print(f"Content length: {len(result.markdown)}")
 
-
 async def demo_content_scraping():
     """
     3. Content Scraping Strategy Demo
@@ -140,7 +138,10 @@ async def demo_content_scraping():
     url = "https://example.com/article"
 
     # Configure with the new LXML strategy
-    config = CrawlerRunConfig(scraping_strategy=LXMLWebScrapingStrategy(), verbose=True)
+    config = CrawlerRunConfig(
+        scraping_strategy=LXMLWebScrapingStrategy(), 
+        verbose=True
+    )
 
     print("Scraping content with LXML strategy...")
     async with crawler:
@@ -148,9 +149,6 @@ async def demo_content_scraping():
         if result.success:
             print("Successfully scraped content using LXML strategy")
 
-
-
-
 async def demo_llm_markdown():
     """
     4. LLM-Powered Markdown Generation Demo
@@ -201,7 +199,6 @@ async def demo_llm_markdown():
             print(result.markdown_v2.fit_markdown[:500])
             print("Successfully generated LLM-filtered markdown")
 
-
 async def demo_robots_compliance():
     """
     5. Robots.txt Compliance Demo
@@ -225,8 +222,6 @@ async def demo_robots_compliance():
             elif result.success:
                 print(f"Successfully crawled: {result.url}")
 
-
-
 async def demo_json_schema_generation():
     """
     7. LLM-Powered Schema Generation Demo
@@ -280,7 +275,6 @@ async def demo_json_schema_generation():
             print(json.dumps(result.extracted_content, indent=2) if result.extracted_content else None)
             print("Successfully used generated schema for crawling")
 
-
 async def demo_proxy_rotation():
     """
     8. Proxy Rotation Demo
@@ -340,7 +334,7 @@ async def main():
     
     # Efficiency & Speed Demos
     print("\n🚀 EFFICIENCY & SPEED DEMOS")
-    # await demo_memory_dispatcher()
+    await demo_memory_dispatcher()
     await demo_streaming_support()
     await demo_content_scraping()