update transitions-overview.md (#1352)

Author: wxsms

src/guide/transitions-overview.md

@@ -176,7 +176,7 @@ Easing can also convey the quality of material being animated. Take this pen for
 
 <common-codepen-snippet title="Bouncing Ball Demo" slug="wvgqyyW" :height="500" :editable="false" />
 
-You can get a lot of unique effects and make your animation very stylish by adjusting your easing. CSS allows you to modify this by adjusting a cubic bezier property, [this playground](https://cubic-bezier.com/#.17,.67,.83,.67) by Lea Verou is very helpful for exploring this.
+You can get a lot of unique effects and make your animation very stylish by adjusting your easing. CSS allows you to modify this by adjusting a cubic-bezier property, [this playground](https://cubic-bezier.com/#.17,.67,.83,.67) by Lea Verou is very helpful for exploring this.
 
 Though you can achieve great effects for simple animation with the two handles the cubic-bezier ease offers, JavaScript allows multiple handles, and therefore, allows for much more variance.