Update security_best_practices.mdx

Author: localden

docs/specification/draft/basic/security_best_practices.mdx

@@ -324,8 +324,6 @@ Client guidance:
 
 - Begin with only baseline scopes (or those specified by initial `WWW-Authenticate`)
 - Cache recent failures to avoid repeated elevation loops for denied scopes
-- Present human-readable rationale: "Need files:write to save changes."
-- Offer user option to decline individual optional scopes when multiple are suggested together
 
 #### Common Mistakes