minor fixes

Author: iliakan

2-ui/3-event-details/7-keyboard-events/article.md

@@ -149,9 +149,9 @@ The `onkeydown` handler here uses `checkPhoneKey` to check for the key pressed.
 
 As we know, the `false` value returned from the event handler, assigned using a DOM property or an attribute, such as above, prevents the default action, so nothing appears in the `<input>` for keys that don't pass the test. (The `true` value returned doesn't affect anything, only returning `false` matters)
 
-Please note that special keys, such as `key:Backspace`, `key:Left`, `key:Right`, do not work in the input. That's a side-effect of the strict filter `checkPhoneKey`.
+Please note that special keys, such as `key:Backspace`, `key:Left`, `key:Right`, do not work in the input. That's a side-effect of the strict filter `checkPhoneKey`. These keys make it return `false`.
 
-Let's relax it a little bit by allowing `key:Left`, `key:Right` arrows and `key:Delete`, `key:Backspace`:
+Let's relax the filter a little bit by allowing `key:Left`, `key:Right` arrows and `key:Delete`, `key:Backspace`:
 
 
 ```html autorun height=60 run