Remove reference to random-number-range example from background tasks blog post (#1501)

- Removed paragraph referencing reflex-examples repository
- Text removal requested to clean up blog post content

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Carlos Cutillas <[email protected]>

Author: devin-ai-integration[bot]

blog/2023-09-28-unlocking-new-workflows-with-background-tasks.md

@@ -106,10 +106,6 @@ continue processing UI events in the foreground.  The only time the UI is
 blocked is during the short period of time where the response is being appended
 to the state.
 
-For a more complete example with comparisons of the two styles, see the
-`random-number-range` app in the
-[reflex-examples](https://github.com/reflex-dev/reflex-examples/blob/main/random-number-range/random_number_range/random_number_range.py)
-repository.
 
 ```md alert warning
 # `@rx.event(background=True)` used to be called `@rx.background`.
@@ -148,4 +144,4 @@ release notes for all the new features and bug fixes.
 
 🔧 Happy Building 🚀
 
--- Reflex Team
+-- Reflex Team