Update sdk.mdx

Added appropriate comments to the Python code. Similarly to the JavaScript code.

Author: artyomboyko

units/en/unit1/sdk.mdx

@@ -27,19 +27,19 @@ from mcp.server.fastmcp import FastMCP
 # Create an MCP server
 mcp = FastMCP("Weather Service")
 
-
+# Tool implementation
 @mcp.tool()
 def get_weather(location: str) -> str:
     """Get the current weather for a specified location."""
     return f"Weather in {location}: Sunny, 72°F"
 
-
+# Resource implementation
 @mcp.resource("weather://{location}")
 def weather_resource(location: str) -> str:
     """Provide weather data as a resource."""
     return f"Weather data for {location}: Sunny, 72°F"
 
-
+# Prompt implementation
 @mcp.prompt()
 def weather_report(location: str) -> str:
     """Create a weather report prompt."""