minor fixes

Author: iliakan

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

@@ -151,7 +151,7 @@ As we know, the `false` value returned from the event handler, assigned using a
 
 Please note that special keys, such as `key:Backspace`, `key:Left`, `key:Right`, `key:Ctrl+V`, do not work in the input. That's a side-effect of the strict filter `checkPhoneKey`.
 
-Let's relax it a little bit:
+Let's relax it a little bit by allowing `key:Left`, `key:Right` arrows and `key:Delete`, `key:Backspace`:
 
 
 ```html autorun height=60 run