fixes

1-js/06-advanced-functions/12-arrow-functions/article.md

@@ -2,7 +2,7 @@
 
 Let's revisit arrow functions.
 
-Arrow functions are not just a "shorthand" for writing small stuff.
+Arrow functions are not just a "shorthand" for writing small stuff. They have some very specific and useful features.
 
 JavaScript is full of situations where we need to write a small function, that's executed somewhere else.
 
@@ -14,7 +14,7 @@ For instance:
 
 It's in the very spirit of JavaScript to create a function and pass it somewhere.
 
-And in such functions we usually don't want to leave the current context.
+And in such functions we usually don't want to leave the current context. That's where arrow functions come in handy.
 
 ## Arrow functions have no "this"
 

2-ui/99-ui-misc/02-selection-range/article.md

@@ -504,7 +504,7 @@ Focus on me, the cursor will be at position 10.
 
 ### Example: modifying selection
 
-To modify the content of the selection, we can use `input.setRangeText`. Of course, we can read `selectionStart/End` and, with the knowledge of the selection, change the corresponding substring of `value`, but `setRangeText` is more powerful and often more convenient.
+To modify the content of the selection, we can use `input.setRangeText()` method. Of course, we can read `selectionStart/End` and, with the knowledge of the selection, change the corresponding substring of `value`, but `setRangeText` is more powerful and often more convenient.
 
 That's a somewhat complex method. In its simplest one-argument form it replaces the user selected range and removes the selection.