docs: update help file

Author: franco-ruggeri

doc/codecompanion-spinner.txt

@@ -64,7 +64,7 @@ logic
 ==============================================================================
 5. Links                                         *codecompanion-spinner-links*
 
-1. *demo*: assets/demo.gif
+1. *demo*: https://github.com/user-attachments/assets/d304db83-2508-4c56-aabf-0265ab05e246
 
 Generated by panvimdoc <https://github.com/kdheepak/panvimdoc>