Update CONTRIBUTING.md

Author: Aris-t2

CONTRIBUTING.md

@@ -7,7 +7,7 @@
 --> https://github.com/Aris-t2/CustomCSSforFx/issues/4
 4. Verify there are no '@namespace' references anywhere in your custom code.
 5. Use available support threads:
-- GENERAL DISCUSSIONS, FEEDBACK, QUESTIONS --> https://github.com/Aris-t2/CustomCSSforFx/discussions/606
+- GENERAL DISCUSSIONS, FEEDBACK, QUESTIONS --> https://github.com/Aris-t2/CustomCSSforFx/discussions/722
 - MULTIROW TABS SUPPORT THREAD --> https://github.com/Aris-t2/CustomCSSforFx/discussions/455
 
 <b>IMPORTANT</b>