Apply suggestions from code review

Co-authored-by: Chengzhong Wu <legendecas@gmail.com>

Author: mcollina

SECURITY.md

@@ -145,7 +145,7 @@ for production use.
 ### V8 flags
 
 Node.js may expose V8 features that are controlled by V8 command-line flags
-(e.g., `--harmony-optional-chaining`, `--max_old_space_size`). These flags
+(e.g., `--js-staging`, `--max_old_space_size`). These flags
 enable or modify V8-level JavaScript engine behavior that is not part of the
 ECMAScript specification that Node.js implements and is not part of the
 Node.js documented API surface.