Further improvements to benefits (feature detection)

Co-authored-by: Keith Cirkel <keithamus@users.noreply.github.com>

documentation/aria-idl.md

@@ -25,7 +25,7 @@ See:
     -   Define interfaces in a way that isn’t tied to a programming language, e.g., could have JavaScript/C++/Python or any other language implementation
     -   Can be used to generate code (IDL files can be used to generate code across multiple languages)
     -   Facilitates cross-language integration (e.g., Python backend can communicate with JavaScript frontend)
--   ***Feature detection***: If (el.someIDLAttribute) is true, then the feature is supported which facilitates user agent detection for that particular attribute
+-   ***Feature detection***: If (`'someIDLAttribute' in el`) is `true`, then the feature is supported; facilitating user agent detection for that particular attribute
 -   ***Type safety***:
     - IDL defines types for properties/methods
     -   Can ensure that only valid data types are passed/returned from APIs which helps with catching errors