Update "declination" to "decline" based on review feedback

Author: nandsha

docs/specification/2025-06-18/client/elicitation.mdx

@@ -317,7 +317,7 @@ The three response actions are:
 Servers should handle each state appropriately:
 
 - **Accept**: Process the submitted data
-- **Decline**: Handle explicit declination (e.g., offer alternatives)
+- **Decline**: Handle explicit decline (e.g., offer alternatives)
 - **Cancel**: Handle dismissal (e.g., prompt again later)
 
 ## Security Considerations