Fix typo in README

SECURITY.md

@@ -20,10 +20,8 @@ I (the author, [@tiangolo](https://x.com/tiangolo)) will review it thoroughly an
 
 ## Public Discussions
 
-Please restrain from publicly discussing a potential security vulnerability. 🙊
-
-It's better to discuss privately and try to find a solution first, to limit the potential impact as much as possible.
-
+Please refrain from publicly disclosing a potential security vulnerability. 🙊
+Kindly report it privately so it can be assessed and addressed responsibly, reducing any possible security impact.
 ---
 
 Thanks for your help!