Minor spelling mistake tooltip.md (#411)

Spelling mistake in "Length"

Author: KomalPatel-github

docs/resources/ui/widgets/built-in-widgets/tooltip.md

@@ -151,7 +151,7 @@ By default, the *Tooltip* appears below the target widget. You can change this s
 
 ### Customize tail size
 
-To change the tail's size, you can use the **Tail Width** and **Tail Lenght** properties.
+To change the tail's size, you can use the **Tail Width** and **Tail Length** properties.
 
 <div style={{
     position: 'relative',
@@ -269,4 +269,4 @@ To change the default duration, move to the **Properties Panel >** set the **Sho
         allowFullScreen
         allow="clipboard-write">
     </iframe>
-</div>
+</div>