Review feedback.

index.bs

@@ -858,7 +858,7 @@ new document. Therefore Sanitizer API is not directly affected by mutated XSS.
 
 If a developer were to retrieve a sanitized node tree as a string, e.g. via
 `.innerHTML`, and to then parse it again then mutated XSS may occur.
-We recommend against this practice. If processing or passing of HTML as a
+We discourage this practice. If processing or passing of HTML as a
 string should be necessary after all, then any string should be considered
 untrusted and should be sanitized (again) when inserting it into the DOM. In
 other words, a sanitized and then serialized HTML tree can no