book: Make working clearer

Co-authored-by: David Else <[email protected]>

Author: nferhat

book/src/editor.md

@@ -101,8 +101,8 @@ what kind of completion is inside the completion menu.
 
 <br>
 
-The value of the map is the text to display inside of the completion menu. By
-default, helix will use the key.
+By default, these values are used as text within the completion menu.
+However, you can replace them with custom text or symbols as shown in the following example:
 
 
 <details>