docs(app): improve get_dad_joke docstring

app.py

@@ -19,13 +19,18 @@ def greet(name: str) -> str:
 def get_dad_joke():
     """
     Fetches a random dad joke from the icanhazdadjoke.com API.
-    The function makes an HTTP GET request to the icanhazdadjoke API
+
+    The function makes an HTTP GET request to the <https://icanhazdadjoke.com/> API
     with appropriate headers to receive JSON response.
+
+    Args:
+        None
     Returns:
         str: A random dad joke if successful, otherwise returns an error message.
             - Success: Returns the joke text
             - Failure: Returns "Failed to retrieve a joke." if the API request fails
             - No joke: Returns "No joke found." if the API response doesn't contain a joke
+
     Requires:
         requests: The requests library must be imported to make HTTP requests
     """