s/help/improve experience/

Co-authored-by: Martin Thomson <[email protected]>

Author: jyasskin

index.bs

@@ -343,7 +343,7 @@ implementation bugs.
 
 Despite this, it is sometimes acceptable
 to break some existing content
-in order to help a large number of the web's users.
+in order to improve the experience for a large number of web users.
 Breakage is more likely to be acceptable if:
 
 * Only a tiny amount of existing content depend on the feature or behavior.